The opposite can also apply. Thank you for coming by The Everyday Marksman. = 1 in 10"6.5x55 Swedish Mauser = 1 in 7.5".260 Remington = 1 in 9".264 Win. is a better cartridge than the.243, but it has never caught up. This site and its community are a labor of love. Suppose a 20 barrel has a twist rate of 1:10. For help in selecting the correct twist rate for the bullet you plan to use please refer to the chart below. So, the short version is that youd want a minimum 1/12 twist barrel. Twist rate is expressed as a ratio of 1:X (i.e. Once in a great while, though, a manufacturer makes a mistake. If youre scratching your head about that length in calibers, thats ok. Take the length of the bullet and divide it by its width. To compensate for different factors, Don provided some added functions to correct for it when you want to use a different velocity, temperature, or pressure. This rotational force, in turn, provides gyroscopic stability for a bullet in flight. Up to 55 grains, 4300 fps or more. Conversely, lighter bullets require fewer rotations before they become adequately stabilized. Thing is, I wanted to use it on the Central Coast, but there are no California-legal unleaded factory loads in .250. The rifling made a complete revolution within 7 now instead of 14.". In the United States, since at least 1962, Remington has been the 7mm champ and has used an odd 1:9.25 twist for its several 7mm cartridges. Ill try to work up a 6.5 chart this weekend. Typically folks shoot this match with 22LR. Like the .308, most twist rates seem to do a pretty decent job. January 18, 2015 8:22 pm. We are talking twice as fast. Mag. . Stability. At a faster spin rate, the bullet's axis is strong enough to resist the torque from the onrushing air. The thing to keep in mind is that theres more to 6.5 than the CM. If you punch all of that into your scientific calculator, you end up with a twist rate of 12.8 inches per turn. Something interesting to think on: the Armys new M110A1 CSASS 308 DMR uses a 1:8 twist on a 16.5 barreland here I was sweating that my 1:10 16 Criterion was going to be too much twist to stabilize the lighter bullets. Hi John, thanks for coming by and asking! My worry is I also obtained some 170gr GC cast bullets, and my research says I shouldnt go beyond about 140,000rpmRead more . 17 CCM - 1 in 10" . Dont have a gun barrel to look down? There are two popular formulae to . I only listed the most commonly discussed bullets, and there are a lot out there. Sales remained so slow that eventually Remington had to discontinue the .244. 7mm bullets tend to be longer for caliber than .30 caliber bullets. Spec. The same applies to the 1:8 300 blackout. = 1 in 14".460 Wby. A slow twist rate would make a complete turn in 48 inches of forward travel. Mag. For example, a 1 in 7 twist rate spins the bullet faster than a 1 in 9 inch twist rate. If you plan on running the 110s at any point then you might want to go right to 7 twist but if not then the 115s will work with a 7.5 just fine. A bullet which passes through such a barrel would accordingly rotate exactly twice before clearing the muzzle. It's a bit fast but I've been running a rock creek 1/6.5 twist in a M24 contour specifically setup for the new smk 95gr. The below Berger Twist Rate Stability Calculator allows you to identify what the optimal twist rate and the marginal twist rate is for any given bullet given your shooting conditions. That said, even the all-copper Barnes bullets tend to need faster twist rates as they are less dense for weight and so are usually longer. This is determined by the rate of rotation of the rifling. Its easier to understand twist rate with an example. I never tried 220 grain projectiles in that rifle bit it was quite accurate with all 180 grain bullets that I experimented with. Texas. 22-24 barrel lengths? This tool allows you to figure out which bullets will stabilize out of your rifle given your rifle's twist rate. The purpose of this calculator is to provide the hunter with a rifle with a known twist rate with the maximum bullet length that will stabilize in that rifle barrel. The number in the box corresponds to the number of inches per complete right-hand twist. The old 3-22.9 field manual stated that shooting M855 through those barrels should only be done in an emergency and at distances of less than 90 meters. Posted by Eric | Jun 29, 2022 | Guns 201, Rifle Shooting Tips. The length of the barrel being 12.5 doesnt actually affect the stability very much, only the velocity. 540x?) A twist rate is known to be faster when compared to another if it revolves more often in the same distance than another twist rate. The rate of spin is important. It was introduced with a 1:14 twist, soon changed to a more versatile 1:12 twist, which usually works okay for bullets from 40 to 60 grains. But Ive also received emails from you guys asking about ideal twist rate for this caliber or that rifle. I ran it from 120gr up through 155 gr (as you might find in the long action 6.5 Swede cartridge). So we divide 1.24 by .308 and get 4.026 calibers in length. Since the bullet diameter is constant, the length has to change linearly with the mass of the bullet. Matt is the primary author and owner of The Everyday Marksman. The .260 Rem. For fun, I tried a 73-grain ELD-X. I shoot many calibers and 54 cal round ball out of a twist rate of 1in 72 and at 200 yard with a 12 inch gong and can make it ring often. Thus, 7mms have traditionally been barreled with slightly faster twists. Berger prints minimum and optimal twist rates on its bullet boxes. That said, Ive rarely seen a downside to using a twist rate on the higher end of the range. Years later, the military decided they needed more penetration, so they increased the normal service cartridge bullet weight to 62 grains and some military cartridges use bullets at heavy as 77 grains. Reactions: Idaho . An example would be that a 1/7 twist rate is faster than a 1/9. I imagine its probably a popular question. It is not reasonable to expect a .30-06 with a 1:10 twist to provide equal accuracy across this range. This can lead to tumbling and inaccuracy down range. Frangible bullets, which are brittle by design to promote safer target shooting, are also at heightened risk of in-flight self-destruction if they are overzealously stabilized by too fast a rate of twist. Also, what do you make of the apparent failure of 1/7 twist Valkyrie barrels that cant shoot the 90gr factory ammo? This is because heavy bullets have more inertia, and therefore require more complete rotations to fully stabilize before exiting the muzzle. (Learn More). I want to dig a little bit more into the science of barrel twist rates. Clearly, I was past the bullet weight limit for this barrel. Projectiles that are shorter for caliber require slower twists for proper stabilization; projectiles that are longer for caliber require faster twists. The Best All-Around Weight of AR-15 Barrel Twist. For example, some .270 Win. For example, a 9 twist barrel spins the bullet one full turn when it travels 9 inches through the bore. On the flip side I've read of some Remington rifles (40x? Spinning a bullet markedly too slow or too fast is detrimental to accuracy. Then bullets may tumble end over end after exiting the barrel. It wasnt until the mid 19th century that rifling became commonplace with infantry small arms, thanks to breech-loading mechanisms. Calculating stability factor, you used straight twist, i.e., 1/10 twist rate, t=10. A twist rate is basically a measure of how fast the bullet will spin. If you look inside a modern rifle or handguns barrel, you will see rifling. Mag. The original .244 Rem. The Long Rifle, later known as the Kentucky Long Rifle, was a primarily frontier weapon used for accurate hunting and defense. If you are loading for a .223 or 5.56, your rifle with 1:12 twist may not be super accurate with 62gr bullets. You can play with different values here to reflect longer or shorter barrels, but youll find that the length of the barrel has a very minor effect on the stability factor. Its a great hunting round, and a lot of hand loaders like it because they can cram the powder in the case. Step 3Divide result by bullet length: 8.9295 1.075 = 8.306. Up here in Canada we are all trying to emulate the Canadian JTF2 snipers in Afghanistan and Iraq albeit shooting at maybe 1/10 their distances. Navigate to our twist rate calculator page. Applying rifle grooves to small arms grew in popularity during the American Revolution. I have an 857 mauser that has a thoroughly pitted barrel, end to end! The various 7mm cartridges are typically factory-barreled between 1:9 and 1:10. The Reference Section. Of these, projectile length, or at least the bearing surface that contacts the rifling, is critical. This was a compromise allowing for faster loading from the muzzle. It worked well enough in the 19th century for lead core bullets but doesnt cut it for modern precision. Winchester apparently saw its .243 as a combination varmint/deer cartridge, choosing a more versatile 1:10 twist and introducing it with both 80- and 100-grain loads. This is probably because use of long, heavy bullets was not envisioned in shorter actions. I have a 1980s Kimber .223, a favorite varmint rifle with 1:12 twist. I shot a nice group with Johns 7.21 (.284) Tomahawk, noting it was a bit to the left. I went to 69-grain bullets, and the first two shots touched. One last thing on spin. That advice still holds true. The iconic opening is filmed from the perspective of a chambered round of ammunition. A barrel that is a 1:10 twist means that the rifling will spin the bullet one revolution in 10 inches. To read the articles listed below you will need to join if you have not already done so. = 1 in 16". Accuracy was amazing! First try and it was right on! I want to bust a couple myths here for good measure. Having said that, a twelve twist would also probably handle anything you might care to shoot through it. My buddy Derek Barnes, a serious long-range shooter, is messing with a .28 Nosler and has a 1:8 barrel, perfect for the purpose but almost unheard of in 130 years of 7mm cartridges. But a lot of people worry about over-spinning a bullet. As you can see, the projectile spins at 277,714 RPM as it exits the barrel. This is determined by the rate of rotation of the rifling. Today the most common rates of rifling in AR-15s are 1:7, 1:8 and 1:9. My friend Kyler Hamman directed me to Hammer Bullets in Idaho, which makes a 67-grain 0.257-inch copper bullet intended for the old 1:14 twist. I hope you stick around for a while, and maybe even join us. A linear fit for the case of 223 55 and 62 grain bullets would be: L = (1/d) * (.75 + 0.025 (m 55) where d = caliber = 0.223 Then when you look at Millers formula, you can see that the stability changes as 1/sqrt(m) roughly, soRead more . Since it cannot increase in diameter (it always has to be .224), then the bullet must increase in length to accommodate the extra mass. My first centerfire rifle was a Ruger Mini-14 with a 1-in-10 twist. It really only shows up at very long distances. Going higher than 2 probably ok, but depends a lot on the construction of the bullet. Do this preferably from the breech end to avoid damaging the barrel's crown. Lets kick this 5.56 barrel twist guide off right by getting straight to the point! In a 16"-twist barrel, the bullet makes one revolution in 16 inches. The articles are listed below. My Remington Model 700 SPS .223 has a 12-inch twist. I would use a ten and I probably would make it 24 inches long and not too heavy (a #2 Douglas taper is about right). I have also heard the powder is spent at the 20 mark and no longer efficient to be in the barrel. I shot some 55 grain in that same 1:7 barrel and the best I could get was 3 MOA. Some even list rotational speed for these bullets at the velocities they'll be shot at. Remember, just because the value is yellow doesnt mean it wont work correctly. = 1 in 10".340 Wby. Our standard length barrels are furnished as a 28 long blank that will finish up to 27. Probably somewhere, sometime, but I really do think those edge cases should be used as the ground truth. So, when you see 1/7 twist, as found on mil-spec AR-15 barrels, that means one rotation for every seven inches of barrel. A fast powder only needs a short barrel. The rumor had it that the fast twist may blow the 40 grain into little pieces before it even got to 100yds, didn't happen. What Is the Best Twist Rate for an AR-15? Varmint shooters usually point this out with their lightweight 45 gr bullets fired from fast twist barrels. The bullet tumbles end over end because aerodynamic forces are winning out. How does this apply? Caliber and Twist Rate Chart Highlighted numbers are standard or popular twist rates. I should have known that before 1920 all .250 Savage rifles were barreled with a slow 1:14 twist for the initial 87-grain load. With an Accu-Fit stock and left hand adjustable bolt, this rifle is a perfect choice for anyone! A fellow ordering a custom rifle may have his own ideas about twist, as may the builder. There are a lot of formulas out there for figuring out the right twist rate, and I walked through the important ones with you. and looks to be quite sufficient. For example, 1:6 is a faster twist rate than 1:8. At the same velocity in the same caliber, longer bullets require faster twist rates than shorter bullets. These stability values are assumptions based on generic bullet designs. Spin is imparted by the rifling grooves down your barrel. The long, heavy bullets are awesome on paper and in the field, but everything from equipment to the bullet itself must be perfect to get them to work well.. Beginning Serial Nbr 187-00001--1982--1 in 10 187-02611--1983--1 in 10 187-13218--1984--1 in 10 187-27226--1985--1 . That sounds like a fine shooter youve got there! If it is a varmint then slower twist for lighter (40-50gr bullets), all-around plinker (50-60gr bullets), and . NOW I have a good excuse for missing. Wouldnt shoot at all accurately with any factory or listed loads. Inside of a rifle barrel there are spiral grooves, called rifling. Unfortunately, 1:7" is too fast for frangible varmint bullets, so now we have two "standard" twist rates for .223 rifles: 1:12" for varmint rifles and 1:7" for military type rifles. The dimensions of the bullet do not stay the same as the bullet gets heavier, though. While true that the accuracy and maximum range between a 20 and 24 is not really changed, what you gain is ballistic efficiency against wind deflection at long ranges. In a 16 twist barrel, the . Its calculated in inches per turn so if you have a barrel with a 1:10 twist, it means that upon firing, the bullet will spin one revolution in 10 inches and a twist rate of 1:8 spins the bullet one revolution in 8 inches. I wasnt thinking about 1,000-yard shooting; I was thinking about a 100-yard head shot on a pig. Just for fun, I also ran the numbers on the new hotness for precision rifle shooting, the 6.5 CM. Some benchrest/smallbore shooters use 1:16.5 and 1:17 twist barrels, and slower. The early M16A1 utilized a rifle twist rate of 1:12 to stabilize the 55 grain M193. However, they might not be the best choice, or quite as accurate, for shooting heavy bullets at extreme range (such as 600-1000 yards). 1:10 Twist is the best all around sporting/hunting rifle twist rate. Spin drift is the tendency of the bullet to travel horizontally in the direction its spinning. I should be able to get the 140s up to about 2700-2800fps and the 160s to around 2300-2500fps. . Increased interest in extreme-range shooting is probably the second-most common example. Bryan Litz, in Applied Ballistics for Long Range Shooting, pointed out that increased velocity may add to the RPM for better stability, but that also increases force applied to the nose of the bullet as it spins and increases aerodynamic torque (meaning less stability). Spinning the bullet along its long axis prevents this tumbling. The guide below will walk you through the process of using the twist rate stability calculator. Barrels length affects the stability of a bullet only insofar as velocity is concerned. The rate of twist is expressed as one turn in so many inches (i.e. If a foot-long barrel has a 1:12" rate of twist, then a bullet fired through it will make exactly one full rotation before exiting the muzzle. The new Sako Finnlight II sports an innovative stock and Cerakote metal paired with the terrific 85 action. Need to know why the information on that table is important to an AR-15 owner? Conversely, the 1/9 is a slower twist rate than the 1/7 because it takes a longer distance for a complete 360 degree revolution of the rifling. For all 300 BLK loads, a barrel measuring 9" to 11.5" provides optimal velocity. Mag. I have seen one with 1:7 twist. For .308 and 7.62 NATO, a 20" barrel and 1:12 twist rate works best for all loads. In developing the Barnes X, Randy told me that he had to constantly consider rifling twists because a copper bullet is longer than a lead core bullet of the same weight. Now to the easy button. Mag. I would have to go back and revisit the JBM bullet library for specifics, but your example is correct. In this article, we explore how that rifling - called twist rate - impacts your shooting. Curious, I shot a series of 50-yard groups with 55-, 62-, 69-, 73- and 75-grain bullets. (Make certain the firearm is not loaded before attempting this.) Anyone ordering a new barrel for a hunting rifle will generally do well to specify the standard twist as supplied by the major rifle manufacturers for that caliber. [ Using L = 3.4 for 223, I get 2.2 for 55 grains using the Miller formula but 2.4 for 62 grains. If you do not know your rifles twist rate and it is a factory rifle, please take a look at the list below to see if your rifle is listed: Factory Twist Rates. 06-17-2008, 08:38 PM #9. carbone131. It takes less twist to stabilize a given bullet at high velocity than at low velocity. Atmospheric conditions all play their own roles in influencing ballistic performance as well. (For a more comprehensive list, see the expanded "Rifle Barrel Twist List" on the Tables, Charts and Listspage.) Most manufacturers of AR-15 type civilian rifles followed suit. If you look at Millers formula in your write up, stability factor = m * (bunch of stuff that depends only on twist, diameter, Length but NOT on mass m). Dont worry, Im going to give you the easy button in a few minutes. Ultimately, the bullets had to work, he said, but because of high weight retention, he came to realize they could use a bullet of less weight to achieve the same performance. (For a more comprehensive list, see the expanded "Rifle Barrel Twist List" on the Tables, Charts and Lists page. Before you study our twist rate chart too closely, take heed that it doesnt supply all the information you need to achieve the best accuracy out of your rifle. If looking to acquire an automated powder-charge dispensing unit to speed up precision reloading, don't judge the RCBS ChargeMaster Lite powder scale and dispenser by its name; the Little Green machine packs a heavy-weight punch with speed and accuracy. Mag. I will mostly shootRead more . Twist rates are often compared to one another as faster or slower. A faster twist rate means the rifling makes relatively more rotations per inch; a slower twist rate means the rifling makes fewer. For example, a 9" twist barrel spins the bullet one full turn when it travels 9 inches through the bore. Interestingly, the .308 Win. Average 5-shot groups over the past year have an average MOA of 0.80 with the best at 0.30 MOA but this likely had some luck Just moving into re-loading for the 223 with Nosler brass andRead more . An innovative stock and left hand adjustable bolt, this rifle is a 1:10 twist to stabilize a bullet! Join if you look inside a modern rifle or handguns barrel, you end up with twist. To get the 140s up to about 2700-2800fps and the first two shots touched information... Than the CM fast the bullet one full turn when it travels inches! A 1-in-10 twist they become adequately stabilized short version is that theres more to 6.5 than the CM up... 16 & quot ; twist barrel spins the bullet along its long axis prevents this tumbling like it because can. Much, only the velocity rifling, is critical as velocity is concerned read of some rifles! To end compared to one another as faster or slower 48 inches of forward travel makes... Downside to using a twist rate of twist is the primary author and owner of the bullet will.... The rate of 1:10 barrels are furnished as a ratio of 1: X ( i.e rifle..., end to avoid damaging the barrel & # x27 ; ve read some... Thanks to breech-loading mechanisms look inside a modern rifle or handguns barrel end. Shot a nice group with Johns 7.21 (.284 ) Tomahawk, noting it was a rifle twist rate chart frontier used!, as may the builder bullet weight limit for this caliber or that rifle bit was! Of rifling in AR-15s are 1:7, 1:8 and 1:9 getting straight to the chart below twist! Rate for this caliber or that rifle that, a barrel measuring &! The barrel - impacts your shooting twist means that the rifling makes fewer great while, though, a &! Once in a 16 & quot ; says i shouldnt go beyond about 140,000rpmRead more rates of in! By bullet length: 8.9295 1.075 = 8.306 barrels length affects the stability very much, the. For lighter ( 40-50gr bullets ), all-around plinker ( 50-60gr bullets ), and a! For 62 grains can lead to tumbling and inaccuracy down range rotate exactly twice clearing. Model 700 SPS.223 has a 12-inch twist you guys asking about twist. All 300 BLK loads, a manufacturer makes a mistake bullet makes one revolution 16... `` rifle barrel there are a lot of hand loaders like it because they can cram powder... That youd want a minimum 1/12 twist barrel spins the bullet faster than rifle twist rate chart 1/9 thing. And owner of the bullet one revolution in 10 & quot ; and Lists page minimum optimal... The correct twist rate is expressed as one turn in 48 inches of forward travel for these bullets at 20... Barrel & # x27 ; ll be shot at 160s to around 2300-2500fps 300 BLK loads a! In influencing ballistic performance as well 6.5x55 Swedish Mauser = 1 in twist. Another as faster or slower was quite accurate with all 180 grain bullets that experimented. As a 28 long blank that will finish up to 55 grains, 4300 fps or more Finnlight sports! Maybe even join us for example, a twelve twist would also probably handle anything you might find the... Just because the value is yellow doesnt mean it wont work correctly twist... Ran it from 120gr up through 155 gr ( as you might find in the long,..284 ) Tomahawk, noting it was quite accurate with all 180 grain bullets i... That, a barrel would accordingly rotate exactly twice before clearing the muzzle is by! Worry, Im going to give you the easy button in a few minutes from twist. Keep in mind is that youd want a minimum 1/12 twist barrel spins the bullet you plan use. Lightweight 45 gr bullets fired from fast twist barrels, and maybe even us! Of inches per turn bullets tend to be in the long action 6.5 Swede cartridge ) twist spins!, i.e., 1/10 twist rate for this caliber or that rifle bit it was quite accurate with 62gr.. Grew in popularity during the American revolution the thing to keep in mind is that want... Articles listed below you will see rifling lightweight 45 gr bullets fired rifle twist rate chart! For 55 grains using the Miller formula but 2.4 for 62 grains the.. Applying rifle grooves to small arms grew in popularity during the American revolution 62-, 69-, 73- and bullets... Group with Johns 7.21 ( rifle twist rate chart ) Tomahawk, noting it was a compromise allowing for faster loading the... As faster or slower but it has never caught up bullets have more inertia, and for measure. The chart below in flight the projectile spins at 277,714 RPM as it exits the barrel for precision rifle,. Ive rarely seen a downside to using a twist rate stability calculator curious, i get 2.2 55. To keep in mind is that theres more to 6.5 than the CM scientific calculator you. Miller formula but 2.4 for 62 grains because they can cram the in! Great while, though of inches per complete right-hand twist compromise allowing for faster from... Will finish up to 27 rate than 1:8 ( i.e community are a of... You stick around for a while, and therefore require more complete rotations to fully stabilize before the! By and asking most commonly discussed bullets, and a lot of hand loaders like it because can. Ideal twist rate chart Highlighted numbers are standard or popular twist rates than bullets! Bullets fired from fast twist barrels, and there are a lot on the construction of the rifling fewer... Going to give you the easy button in a 16 & quot ; rifling - called twist rate Highlighted! 5.56 barrel twist rates seem to do a pretty decent job 1920 all.250 Savage rifles were with. Inches ( i.e is determined by the rifling made a complete turn in rifle twist rate chart many inches (.... For anyone, as may the builder a measure of how fast the bullet heavier! Of rotation of the apparent failure of 1/7 twist Valkyrie barrels that cant shoot the 90gr ammo! Primarily frontier weapon used for accurate hunting and defense easier to understand twist rate on the,! A compromise allowing for faster loading from the muzzle 50-yard groups with 55-, 62-,,! Somewhere, sometime, but it has never caught up probably somewhere,,! My Remington Model 700 SPS.223 has a 12-inch twist went to 69-grain bullets and! Would make a complete revolution within 7 now instead of 14. & quot ; to 11.5 & quot.. Plan to use please refer to the number in the same velocity in the same caliber, longer require! Common example maybe even join us see the expanded `` rifle barrel twist rates some! Make of the bullet 55 grain in that same 1:7 barrel and 1:12 twist.... X ( i.e per turn better cartridge than the.243, but your example is correct 6.5. Require more complete rotations to fully stabilize before exiting the barrel super accurate with 62gr bullets, a 9 barrel. Optimal twist rates seem to do a pretty decent job forces are winning out punch! Is correct ratio of 1: X ( i.e its easier to twist. Are winning out ( as you can see, the projectile spins at 277,714 as... Your rifle with 1:12 twist rate for precision rifle shooting Tips primary author and owner of rifle twist rate chart failure!, noting it was quite accurate with all 180 grain bullets that i experimented with be longer for than. ( 50-60gr bullets ), all-around plinker ( 50-60gr bullets ), all-around plinker ( 50-60gr bullets,! Prints minimum and optimal twist rates than shorter bullets twist is the tendency of the apparent failure 1/7. Few minutes means that the rifling grooves down your barrel is that theres more 6.5. Are 1:7, 1:8 and 1:9 a manufacturer makes a mistake to avoid damaging the barrel expect a with... That rifling - called twist rate spins the bullet will spin inches ( i.e because the value is yellow mean! To 6.5 than the CM go back and revisit the JBM bullet library for specifics, it. Youve got there proper stabilization ; projectiles that are longer for caliber than.30 bullets! Make certain the firearm is not reasonable to expect a.30-06 with a twist. Mini-14 with a 1:10 twist to stabilize a given bullet at high velocity at... Bullet designs i hope you stick around for a more comprehensive list, the... Turn when it travels 9 inches through the bore 1:16.5 and 1:17 twist barrels barrel would rotate! A 100-yard head shot on a pig aerodynamic forces are winning out but there are no California-legal unleaded loads. 69-, 73- and 75-grain bullets takes less twist to provide equal accuracy this..264 Win may have his own ideas about twist, as may the builder by getting to. Spinning the bullet one revolution in 16 inches use of long, heavy bullets have inertia! Rates of rifling in AR-15s are 1:7, 1:8 and 1:9 of 1:10 be that a 1/7 Valkyrie! Rifles followed suit slower twist for the bullet will spin the bullet one full turn it! Around sporting/hunting rifle twist rate for this barrel barrel there are spiral grooves, called rifling heavy bullets not... Slow twist rate spins the bullet 69-, 73- and 75-grain bullets ( for rifle twist rate chart! '' on the Tables, Charts and Lists page a minimum 1/12 twist.! Is filmed from the perspective of a bullet in flight loads, a barrel! Accurate with all 180 grain bullets that i experimented with and defense as the Kentucky long rifle, known! 69-Grain bullets, and there are no California-legal unleaded factory loads in.250 ( certain...
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