A rifling broach is a long rod with a series of cutter discs perpendicular to the axis of the rod. Button rifling is done by pulling a solid carbide forming die (referred to as a button) through the drilled and reamed barrel bore. Correct me if I'm wrong, but what made 5R famous was its enhancement over other geometries of cut-rifling . Rock Creek Barrels are made in Albany, WI. Cut rifling inflicts virtually no stress in a match barrel shop as the rifling machine only takes a tiny cut from a groove at one time. To simplify, cut rifling involves actually cutting or scraping the grooves in the steel to eventually form the lands and grooves of the rifling. In its traditional form, cut rifling may be described as a single-point cutting system using a “hook. The Broughton 5c rifling looks alot like the rifling in a glock no sharp edges. The company built their own state-of-the-art cut rifling machines, which can hold uniform twist rates to ten-thousandths level (four decimal places) accuracy. Invented in Nuremberg around 1520, the cut-rifling technique creates spiral grooves in the barrel by removing steel using some form of cutter. Bear Creek Arsenal. For background, current thought is to build a 600 yard f classer, right now looking at a 260 AI or variant thereof. Fairly sharp , (but not too sharp as to cut the patches) lands grip the best. Why because they don’t understand the tooling for cut rifling is one. Also I do believe in the 5R rifling does help fight bullet failure. The whole stress relieving process takes 42 hours. Also no barrel maker can measure for residual stress in the material. ” In the cut-rifling. LBC uses precision cut rifling when making their barrels and the barrels on these match rifles have a 1:10″ twist with five lands and grooves. So, cut rifling is still favored by many manufacturers. The process is usually very consistant, with a very fine bore finish, and produces a better than average accuracy, with less cost than cut rifling. The smooth-bore barrels are attached to a rifling lathe after forging. In its traditional form, cut rifling may be described as a single point broaching system using a "hook" cutter. Inspect the cutter for any damage or worn parts and ensure that all parts are in. 1675 posts · Joined 2007. Cut rifling: A cutting tool is drawn through the bore, using either a spiral guide or a system of gears. Button-swaged rifling. Then he’d. The carbide button tool is attached to a rod of high tensile steel, and the other end of the long rod is attached to a. None of which can be done on a standard lathe. Definitions. The Foam Shop is committed to reducing the waste that ends up in our local landfills. With their painstakingly meticulous manufacturing process, Krieger Barrels ensures every barrel is made with supreme accuracy and precision in mind. This spin keeps the bullet travelling in a point-first direction and lessens any tendency for it to. However, this situation will change as many firearms now being made are being rifled by newer methods which have the advantage of being. Grooves: Round bottom CUT rifling . This change in cutter geometry, along with several changes made to the machines themselves, have made the act of cut. Is this change probably due to the cut rifling vs button? or a change in brass and primers?They can be cut in (cut rifling,) pressed in (button rifling), or hammered in (hammer forging). The idea of rifling a barrel to make it shoot truer and harder was not new, to be sure. 1. It is chambered in 30 BR and it is accurate. 500 Mag Rifling. The quality of the barrels turned out by this method was very good, but it is a time-consuming process that slowed down production (the scrape cutter rifling process took about an hour to complete, and the hook cutter took about 15 minutes). As we noted in the previous post, Cut Rifling produces very accurate results, but it is very slow to manufacture as the rifling is cut little by little. The video show the huge, complex machines used — bore-drilling equipment and hydraulic riflers. It stands apart from most modern barrels’ six lands configuration. 0001” of material at each pass, thus requiring. Don't know about Chanlyn's backlog. The four basic methods of making rifling in a barrel are single-point, broach, button, and hammer-forged. The grooves are usually parallel in barrels while the sides of the lands are not. By the nature of the manufacturing process, cut-rifling puts fewer stresses in the steel and twist rate is more likely to be uniform. In polygonal-rifled barrels, the barrel (and hence the bore) is cold hammer forged (or otherwise twisted) creating swells or mounds, also giving the bore a defined rate of twist. Barrels for unlimited type rifles might be made from a larger diameter, and those for rimfire rifles from 1″ diameter or so. That gas seal gives polygonal guns an. Other common methods include cut rifling, hammer forging, and broach rifling. Since the rifling is cut by a broach, you need a different broach for different rifling twist rates. Then the rerifling process involves the rifling cutter moving in and out of the barrel approximately 300 times (50 times per groove). Pioneer Michigan Broach Company is one of the leading suppliers of rifling and bore broaches in the nation. The grooves cut around the shank of many of today’s bullets solve the problems associated. A button puller is another 1 axis machine with highly custom tooling. A broaching tool may be pulled or pushed along a workpiece. 5-284. single point cutting yields identical grooves that have less than . As you draw the rod back, the patch should fall off. 1. A machine pulls a sharp cutter down the bore, removing a thin layer of steel in a spiral. 005 to . groove deeper on one side than the other, thus giving the illusion of "ratchet" rifling. 6 x 0. The mold matched the 1 in 20″ twist of the rifling. Each groove is cut individually and with multiple passes, making it time-consuming and expensive. 54 – 1/66. Double scrap cutter tooling was being used/made back even when the cut rifling was done manually by a human pulling the cutter thru the barrel by hand! Places have converted/modified the Pratt’s for pulling broaches and even pulling buttons. 3crows said: No, Remington built Marlin . . Rifling. With our experience and UNISIG standardized machines we can produce rifled barrels over 155 mm caliber and at lengths of over 30 ft. "Hope you have better luck than I did. 0001” deviation between each other because they. Rifling Twist:. ” Like leather seats in a fine automobile, cut rifling pairs with upscale custom rifles. He had an idea for a different method to rifle barrels―single-point cut rifle barrels on a CNC rifler. 6. One wonders if it can be automated to run faster. I wanted to use 250 grain rn and rnfp bullets. This 3. It uses a long tool with multiple teeth. We proudly create rifle barrels for F-Class competitors,. Cut rifling . That is why . It is used for critical operations where precise angle or depth control must be maintained. Notice there are two headspace reference dimensions for the chamber. . To speed up production during WW II, the bore of the barrels was machined by long cutters having many teeth of increasing size called broaches. I personally think the whole cut rifled vs button rifled thing is over done and the merits of cut rifling and the downfalls of button rifling are often exaggerated. 35 Remington microgroove rifled barrel. Cut-Rifling: This is the oldest and most accurate method of rifling. See the figure below. Add to Wishlist. Marlin started using Microgroove rifling in the early 50's and before that they used Ballard rifling. Describe polygonal rifling: Polygonal rifling is formed by hammering the barrel from the outside and is used to describe bores with unconventional rifling. Krieger barrels are single-point cut-rifled, and hand lapped after reaming and after rifling, which is the most time-consuming method for rifling a barrel. He so when he cut the rifling, the round edges of the cutter were deeper than the center of the groove. It's advanced down the blank at about an inch per minute. This process takes significantly longer than. An ordinary Glock pistol. Cut Rifling: The oldest method of rifling a barrel, the process removes metal from the bore using a single-blade, hook-type cutter. They varied a lot!Krieger Barrels has been making premium rifle barrels for over 30 years. In its traditional form, cut rifling may be described as a single-point cutting system using a “hook” cutter. So we are only cutting one groove at a time at an approx. What im saying is from what Ive seen from two different barrels with diferent styles of rifling. Traditional (Lands-and-Grooves) Rifling Standard rifling in pistols, which seems like an after-thought to most people, is called Lands-and-Grooves rifling. The cut rifling machine is old but functions flawlessly. Even if you had all the correct equipment to produce a rifled barrel like a deep hole drill a rifling, machine tool and cutter grinder ect, the skill and expertise to produce a quality blank is also needed. 5. Each cut, or groove, is separated by a ridge of metal called the land. This required multiple iterative passes of a cutting head for each groove (at first this was done with a "scrape cutter", and later a "hook cutter"). Button rifling is done with a straight barrel blank to reduce the amount of variation in the groove diameter. Which rifling technique involves the use of cold-working to harden the interior of the barrel and permits the use of. Gun-maker Bear Creek Arsenal has a good article on its website about rifling barrels. With cut rifling, grooves are carved into the barrel using a cutting tool, whereas with button rifling, grooves are pressed into the metal using a hardened steel button. The answer was the broach. ” In the cut-rifling. pulled button also continues. Button or Cut rifle for a 6. However, single point cut rifling takes a lot of time and is, therefore, quite costly. All of our barrels are manufactured using single-point cut-rifling and each and every barrel we make is thoroughly inspected and held to the same premium match grade standards, whether its an ammunition test barrel, a custom bolt action barrel or a ready-to-install finish chambered. com. . The Castle 110 is fitted with a router that cuts the. #23 · Oct 2, 2023. This rifling-machine post will still be here when you come back). May require live pilot with appropriate sized. "Button rifling is an efficient and easier process than cut rifling to get a quality barrel," he said. Marlin's Microgroove Barrels. This type of rifling is produced with Hammer Forging . 60. There are four ways to produce the grooves: Cut rifling. Hammer forging has a distinct advantage here. There is even a sequence showing chambers being cut. There are four ways to produce the grooves: Cut rifling. It's a production method for hundreds of barrels rather than being suited to a one-off. While the number of companies offering reboring has decreased considerably in the past few decades, the few remaining in the U. Images of Cut-Rifling process courtesy Accurate Shooter Rifling is usually expressed as a twist rate; that is the length required to complete a full revolution along the horizontal access. #10. Made by a broach cutter or button; rifling with sharp edges. Williams Scrap Iron & Metals Inc - Recycling Center in Victoria, 2690 MUNNS RD, Victoria, British Columbia, Canada. This hook has to be pulled through the barrel’s bore on multiple passes before the process is complete. provide exceptional accuracy. Last edited by Fishbed77; December 5, 2013 at 04:23 PM. The quality of the barrels turned out by this method was very good, but it is a time-consuming process that slowed down production (the scrape cutter rifling process took about an hour to complete. There has to be a reason everyone does it and its not just cost alone. Instead of being smaller than the radius of the bore, the radius of the cutter should be at least twice as large as the bore radius. 5R – A 5-groove rifling pattern that is sloped or angled side to the “lands. The rifle is also available with an optional 20″ or 18″ barrel length as well as a muzzle brake if you so desire, but the recoil of this rifle is easily manageable. A rifling broach is a long rod with a series of cutter discs perpendicular to the axis of the rod. Anything gained by using 5R rifling, is then subsequently lost. rifling - the cutting of spiral grooves on the inside of the barrel of a firearm. They have 7 twin spindle drills, 2 twin spindle reamers, and 5 twin spindle rifles. with the catch being that we were always talking about cut-rifling. We do single point cut rifling and don’t induce and stress in the steel. Then button rifled without and honing or lapping before or after drilling. Fryxell. The oldest (and the slowest) is the use of a single steel scraper attached to a long rod to cut each groove individually. The cut-rifling method removes metal from the surface of the bore to create the grooves using a single-bladed, hook-type cutter. There is a slightly higher bullet velocity in polygonal rifling and they are easier to clean than conventional/cut rifling. This method uses a carbide “hook” to cut a single groove over many passes. fred January 2, 2015 at 22:01. “But the process is slow. groove deeper on one side than the other, thus giving the illusion of "ratchet" rifling. The first thing I did when I took the rifle out of the box was to weigh it and it was just barely over six pounds. For a pistol, broach or button does an equally fine job. DonD. This process is done after there's a hole in the barrel blank. The seller says, "its an early 70s gun, with ballard type rifling" Well, I for sure knew better, and should have not done it, but took his word and then looked at the actual rifling later. A real cut rifling machine is getting closer to a real 3 axis machine. What is Button Rifling? In button rifling, the “button” is actually a tool made of tungsten carbide. The main difference between button rifling and broaching is that broaching cut metal; button rifling simply pushes the metal out of the way. 2. As the name implies, the 5-R rifling on the 20-inch stainless steel, hammer-forged barrel is one of the rifle’s major features. 300 Blackout Barrels for 2022 Faxon Firearms . The port has to be cut very accurate, as the scrape cutter must fit it closely with no movement. The traditional method is called single-point cut rifling. The Springfield Armory tried using longer cutters, broaches, that could be pushed through the barrel by a hydraulic ram and essentially cut the two grooves of the rifling at one pass. This comment assumes this rig is a cut rifling machine. This process is done after there's a hole in the barrel blank. Cut rifling. A bullet traveling down a 12-inch barrel with a 1:14” rate of twist will still be spun at the 1:14” rate. Button rifling causes the metal in the bore to displace around the die and is. Legit print (The Springfield 1903 Rifles by Brophy, pg. 1. Most button rifling mftrs will flute BEFORE final lapping and not after. There are four ways to produce the grooves: Cut rifling. After. $189. 640″ minimum – maximum dimension from the breech face (bolt face) to that point in the chamber that measures . . 28-calibers shoot. Our President (my father), Steve Dahlke, partnered with John Krieger to establish a button rifling process capable of match grade performance. Lots of fine grooves, but nothing on the barrel about "micro groove" rifling, it has an 8 digit serial, 21XXXXXX. It is possible to make a rifling machine to do cut rifling out of a lathe, but it is no longer a lathe after the required modifications. The twist is exact, where as other forms of rifling can have variances due to the process they use. formation, shaping - the act of fabricating something in a particular shape. Take your rotary cutter apart. Brux Barrels is a machine tool company located in Lodi, Wisconsin, specializing in the finest custom-made cut-rifled barrels. , a receiver only. Some people don't like the looks because it is impossible to get the square corners on the lands and grooves. An early method of introducing rifling to a pre-drilled barrel was to use a cutter mounted on a square-section rod, accurately twisted into a spiral of the desired pitch, mounted in two fixed square-section holes. It takes a LOT of effort to pull a . In a 50 caliber rifle, the cutter is ground to an exact radius to create a round shape that is a circle. 3642). In addition, the article describes a new (and somewhat radical) method, Cation Rifling, which employs acid to etch rifling. Turn the blade. 6K fps. Cut Rifling Machines. Button barrels the twist is mostly controlled by the shape of the button and the twist rate can vary depending on many variables. Are you meaning to say that they use a button to form their rifling? Because a button doesnt cut and your claim they they use a button to cut is objectively incorrect. The cutter body features a TiCN coating for long-lasting accuracy of results. then a set of gripper fingers engage the adjuster and raises the cutter head for. depth of . Cut rifling is done by hand or with a tool that cuts one groove at a time through the barrel. The button was also turned by a spiral guide,and was pushed and. You may be surprised to learn that cut-rifling is probably the oldest method of rifling a barrel. Yes, each is a different method of rifling, but Microgroove rifling generally consists of 12 lands and grooves, vs 4-6 lands and grooves for other methods of rifling a bore including Ballard rifling. Krieger Barrels offers a wide variety of twist rates that are appropriate for popular bullet weights in any given caliber but it is also possible to specify your own custom twist rate. However, the latter IMO, would be pointless as it leaves stresses in the barrel. As previously stated it is hard to get extra deep rifling to seal, and not burn up the patch. The cut-rifling method removes metal from the surface of the bore to create the grooves using a single-bladed, hook-type cutter of groove width that is pulled through the cold barrel. 54 – 1/66. Please allow 3-5 business days from order placement to shipment to allow us time to contour. The process of Single Point Cut Rifling is the most stress free way to rifle a barrel. Cut Rifling. stefan73 Sergeant. Remove the cutter and using the knife, slightly deepen the lines. Hammer Forged. Cut rifling is the first rifling method to date which was invented in Germany around 500 years ago. I see now that manufacturers are using the "5R" label on both hammer. Lands and grooves having a rounded profile. Standard in swamp barrels. Here’s an easy way to determine the approximate twist rate of your barrel. The discs are. The TAC 501 rifle system is a heavy 416 SS barrel with cut rifling, manually operated, detachable box magazine with five +1 shot capacity. due to the superior throughput of hammer forging and button rifling. The cutter removes approximately . A broach can be used to cut rifling into the inner surface of a barrel, b. Unlike the above-mentioned barrel makers who usually specialize in one rifling method (either button or single cut rifling), Rock Creek offers either rifling solution. The cutter is pulled through again and again, deepening slightly between passes until the groove is the desired depth. A round bottom groove design is very good for PRB's, with deeper grooves. 50. 22 to 50 BMG. Now them making 20mm, 25, 30 and up to 105mm they can do and if I recall correctly they do a form of cut rifling but they just cannot do small caliber stuff. Hammer forging also work hardens the rifling. Invented in N uremberg around 1520, the cut-rifling technique creates spiral grooves in the barrel by removing steel using some form of cutter. Cut rifling carves the rifling into the barrel a very small amount at a time, just like turning on a lathe is cutting the metal itself generally by no more than 50-150 thousandths of an inch at a time (depends on the lathe and tooling). The ogives jammed into the leade. This process is no longer common. 1 diameter. I also have a late 336SS and it definitely has MG. Electron discharge machining (EDM) The following types of rifling use similar processes as the ones aforementioned. Their single-point cut-rifling process delivers the most consistent and accurate results. This cutter body includes a single carbide cutter. 6. See Figure 103 & 104. It also work hardens the rifling. In 1953 Marlin Firearms was issued U. Krieger Barrels offers a wide variety of twist rates that are appropriate for popular bullet weights in any given caliber but it is also possible to specify your own custom twist rate. 003″ – . Also from just some recent testing by a bullet maker/ammo maker a few months ago is they do believe that they found that the 5R rifling helps the flight of the bullet in the transonic range vs a 4 groove barrel that was also being tested the bullet had a disturbance in the. The top shooters in Benchrest are the ones who can really 'see' the minute differences in barrel accuracy. The elliptical gears were to speed up the return of the cutter [the rifling rod passed thru the barrel with a scrape cutter and a tapered "needle" to raise same]. Equipping the barrel with the spiral grooves that spin-stabilize a bullet is the essential operation that defines an entire category of firearms. The traditional method is called single-point cut rifling. 1 diameter. 5” barrel is a match grade stainless steel barrel with a 1 in 15 twist. Cut Rifling consists of removing steel from the inside of a barrel using a cutting tool with a hard point. The carbide button tool is attached to a rod of high tensile steel, and the other end of the long rod is attached to a. Contact us to discuss your large-scale defense projects. at the center of the slot I drill through to the shoe recess, 0. We use a HAAS T-L 2 Lathe for the ent. You used to have to order 5R barrels from Boots alone, but now there are several custom barrel shops offering cut rifling 5R barrels in various. The 80DL was made from 1941-1964 and the 80C was made from 1941-1971. You can see this in the image above . Sako, Steyr and others have proved that they can make some incredibly accurate high volume hammer forged barrels. Regarding thoughts on 5r, an odd number of lands/grooves creates less stress on the bullet as it passes down the barrel and if memory serves correctly it also allows for better or more uniform gas seal with less stress on the bullet than even rifling count- add to that the. However, this situation will change as many firearms now being made are being rifled by newer methods which have the advantage of. We start with 4150 chrome-moly or 416R stainless steel double stress relieved bar stock, bore with the renowned Barnes gun drill, ream with an industry-standard Pratt & Whitney reamer, and then hand lap each barrel to our high-precision standards. The rifling is always putting a fresh bite on the bullet as it goes down the bore of the barrel. Done well, button rifling probably makes the next smoothest barrels. They charge more for it because it takes substantially longer to produce due to the way the rifling is imparted to. (see my homepage) Also see page 204 in the 1968 Gun Digest. They are owned and operated by shooters who have been involved in barrel making for many years. This may be changing with the advent of contoured (5R) cut riflings. Conversely, the scrape cutter has mu l ti-point cutters inset into the opposed sides that can scraped a minimal of two opposed grooves to all grooves at a time. When the gun is discharged, these grooves cause the bullet to spin as it travels the length of the barrel and thus stabilize the bullet during flight. Rifling begins by mounting the barrel in the machine and setting the desired direction and rate of twist. This is why . 58 caliber, 3 Land & Groove, 1 in 72" Twist barrels, and most importantly, just like the originals, the machine cut "Progressive Depth Rifling-just like that found in original Springfield rifle-musket barrels. Broached rifling. 22 rimfires seem to be the best candidates for button rifling. The work hardening of the barrel steel caused by the button results in a bore surface that is denser than a cut surface. Then the grooves are cut on a sine-bar rifling machine with a single-point cutter. Each disc on the broach is a mirror image of the. Oct 31, 2023 #23 ; Frank Green said:By: Glen E. 5355 posts · Joined 2019. The rifling was BIGGER in diameter than the BORE size. The work hardening of the barrel steel caused by the button results in a bore surface that is denser than a cut surface. usually much shallower than conventional cut rifling. While button or cut rifling must start with a hole somewhat smaller than finished size, hammer forged blanks have holes about 20% larger than finished size. 5R is an improvement over conventional rifling by changing the shape and configuration of the lands and grooves. The drawbar attaches to the worm wheel and to the rifling cutter with precision tapered cross pins. 5R – A 5-groove rifling pattern that is sloped or angled side to the “lands. Cut Rifling, along with Button Rifling machines are for smaller calibers from 0. Cut-Rifling - All the Difference in Custom Rifle Barrel Fabrication. The Model 444 was introduced with a 12. It's more susceptible to button slip (twist rate error) and displacing the material work hardens it and creates internal stresses. Rifling twist rate can be changed. And my thought is that square edge of the lands being sharp wear faster. Didn't copper foul at all. This is on a CBA Heavy category rifle and using cast bullets of course. Then I cut a slot about 0. Oct 19, 2023. 32 and . This required multiple iterative passes of a cutting head for each groove (at first this was done with a "scrape cutter", and later a "hook cutter"). The grooves are also cut with a ROUND or RADIUSED bottom. Broach cut rifling cuts all the grooves at the same time as the broach is pulled through the barrel. These methods are the „ scrape cutter " method and the „ hook cutter " method. This method is used on most high-precision target barrels. Cutting is similar to broaching. Before 1950 all Marlin barrels were made by drilling the bore, and then cutting the rifling one groove at a time on a sine-bar machine. A machine pulls a sharp cutter down the bore, removing a thin layer of steel in a spiral. DeHoff gun barrel machines are used by over 50 firearms companies all over the world. Only way I could get "blue" on the patch,. Many of the largest and most respected names in the firearms industry rely on us for our outstanding commitment to quality and on-time delivery for their firearm related tooling. It would be a lot more durable. One of the main purposes of Microgroove rifling was to help the bullet seal off the bore better to keep the expanding gas behind the bullet, and. Definitions. Does the material of the barrel affect rifling choice? Yes, the material of the barrel can affect the choice of rifling, as softer metals may not hold up as well to the erosion caused by cut rifling. Must say I prefer cut rifling. Polygonal rifling. The pressure exerted by a burning charge of powder in the chamber of a gun. The cut-rifling method removes metal from the surface of the bore to create the grooves using a single-bladed, hook-type cutter of groove width that is pulled through the cold barrel. Osprey Barrel Works is a premier brand, 416RR CReS precision rifle blank. 308-inch bullets instead of . Here are some generalizations. Machine will cut up to a 26" by 1 1/16" barrel with a twist of as much 1 in 10". 016 deep. The result is a clean, 3-degree pocket hole with minimal tear-out, around either the pocket or the pilot hole. These days, specialized equipment is used to insert a cutter in the drilled-and-reamed bore of the billet in order to cut and remove a small amount of steel with each pass of the cutter. . Cylinder - The rotatable part of a revolver that contains the chambers. Mine shot about 4" at 50 yards off the bench with dozens of load combinations tried. This article describes in detail how barrels are crafted, using both cut-rifling and button-rifling methods. It is essentially a negative image of the barrel, i. How does button rifling compare to cut rifling? Button rifling is generally considered more cost-effective than cut rifling as it requires less time and labor. The part that grips the patch is the edge of the rifling. The rifling process is a key part of barrel manufacturing, resulting in lands (bore) and grooves that create a spiral down the length of the barrel. The rifling button is pulled a. The lands and grooves are visible in reverse, spiraling the full length. The Model 444 was introduced with a 12. It causes the bullet or projectile to spin as it flies through the air. This required multiple iterative passes of a cutting head for each groove (at first this was done with a "scrape cutter", and later a "hook. It uses a long tool with multiple teeth. You may need to adjust the speed of the cutter as you make the cuts. Drill and reamer marks are not removed by button rifling as they are with cut. Inside of the rifled barrel of a French 75 mm gun of WWI. This is the technique that puts the minimum amount of stress into a rifle barrel. Standard procedure is to remove . Krieger Barrels has been making premium rifle barrels for over 30 years. My dad made both button and scrape cutter rifling machines to rifle his ML barrels up to 60 cal and 2in dia. The button is pushed or pulled through the barrel to press. On the subject of cut rifling depth, variation is groove depth is not a new tooling proposition. What im saying is from what Ive seen from two different barrels with diferent styles of rifling. The only cut rifled 1911 barrels I am aware of are Lissners. Aug 27, 2011. 40 – 1/48. How many grooves does a hook cutter make with one swipe? 1. I plan on using a 12 foot 2 x 8 for a base. Many ways have been developed for making a bullet rotate through a. This carbide Multi-flute Reamer of usually 4 or 6 Flutes is pulled or pushed through a gun drilled barrel to accurately control the surface finish and size of the ID of the barrel prior to rifling. It is available in three distinct finishes, including simple Black DLC, along with Titanium Nitride and Chameleon PVD as well. Adding rifling to a bore that is sized for smoothbore use will likely impart little spin to the projectile and cause a lot of fouling from gas flowing between the projectile and the bore. Then the rifling was cut. Mar 6, 2006 2,869 2,608 CENLA. It is essentially a negative image of the barrel, i. A sine-bar scrape- or hook-rifling setup is far more suited to one-offs. It happens when the top of the rifling cutter is ground on an angle and it will cut the. the grooves to be cut are carved in relief on the button surface.