Intelligent information provided with clarity illustrates understanding and the ability to communicate effectively. Rifling imparts rotational force to the projectile. The following year they reintroduced the exact same cartridge as the 6mm Rem. 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. 1:11, 3.58 deg. Based on the formulas above, I put together some charts to help you in the future. Most of us mere mortals dont worry about spin drift, but its a real effect that long-range shooters must consider. I removed Johns spin drift allowance. I have heard that .308 has the same accuracy and distance with a 20 barrel as it would 24 due to harmonics etc. To read an article on bullet design and download a free program that calculates twist rate based on specific bullet dimensions Click Here. For example, a 175 grain SMK .308 bullet is 1.24 long. The best twist rate for a 5.56 firearm (including most AR-15s) depends on the ammunition it is firing. Its grooves and lands actively engage with a bullet as it passes through the barrel. 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. The formula did, however, provide a foundation for further development. In ballistics, the center of pressure is the point where all of the aerodynamic forces, particularly lift and drag, are equalized. So barrels differ, but I know from past experience this barrels accuracy limit is about 60 grains. Any thoughts on the matter? I would think you could use as heavy a bullet as you desired with you 1-10 TR barrel. These are intended to spin the bullet to keep it stable (point on), without wobbling or tumbling, during its flight to the target. For most loads, 5.56 NATO and .223 Rem do best with a 16" barrel and 1:8 twist rate. Needless to say, .244 sales languished while .243 Winchester sales soared. For practical purposes, you really cant overspin a bullet from an accuracy perspective. Up to 55 grains, 4100 to 4300 fps. If the center of pressure is in front or above the center of gravity, as with a bullet, then the lift and drag forces induce torquing effect where the projectile wants to tumble end over end. These bullets tend to change their stability factor as velocity decreases. Learn how your comment data is processed. I thought it was interesting that the Nosler behaved differently. A lot of new bullet designs include polymer tips to aid with aerodynamics. You will commonly see a 1-in-8 twist in .223 Wylde chamberings, and it is popular among 3-gun and and other competition shooters. Mag. This post is all about finding the right twist rate for your rifle and ammunition. Kimber's Hunter Pro Desolve Blak takes the firm's more affordable mountain rifle to new heights. For example, 1:6" is a faster twist rate than 1:8". Using them will allow you to estimate the heaviest/longest bullet a gun will stabilize based on the caliber (left-most column) and twist rate in inches (top-most row). A rifled barrel works simply enough: Spiraling grooves and lands on the bore force the bullet to rotate as it passes through the barrel. Copyright 2023 AMMOMAN.com. The 1-10 twist rate is/was standard for the 30-06. The tightness of the spiral is called the "twist rate.". A 1/10 should honestly work with just about anything that fits in at mag length. Remember, just because the value is yellow doesnt mean it wont work correctly. Projectile Weight. The Best All-Around Weight of AR-15 Barrel Twist. Smith & Wesson took a page out of its .38 Spl./.357 Mag. This calculator is used to find the optimal twist rate for your bullet. AR Barrel Rifling. We are talking twice as fast. PMC M193) is 1:12 or 1:10. Place the patch on the jag and insert it into the barrel. You cant control where the tip is pointing at any given time, however, so dont worry about it. Granted that there is some leeway in the calculations, but it appears to me that there isnt an ideal do all barrel twist rate for 300 BLK. 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. ThatRead more . Keep in mind also that the M110A1 is not a sniper rifle and will mostly be fed light M80A1 ammo instead of 175gr M118LR. Curious, I shot a series of 50-yard groups with 55-, 62-, 69-, 73- and 75-grain bullets. In general, if you are going to shoot only 90-grain .22-250 bullets from your rifle, this is an effective twist rate. Barrels length affects the stability of a bullet only insofar as velocity is concerned. RifleShooter Magazine editor Scott Rupp breaks down all the features of the Mossberg Patriot Predator rifle chambered in 6.5 PRC. Where I am from, a lot of old timers said that it is dangerous to shoot the M855 out of the old M16 barrels. This was later tightened to 1:12" for long range shooting, which works very well with bullets weighing 40-60 grains, the usual .22 centerfire bullet weight range. Some manufacturers have shifted to 1:9; but 1:8 twist is most common with the 6.5mm Creedmoor. The most common barrel twist rates for modern rifles are ratios of 1:7, 1:8 and 1:9. Then he turnedRead more . Slower twists may give slightly lower pressure, as well as very slightly better accuracy with the lighter bullets in each caliber. Where there are two twist rates in common use, for example 1:10 and 1:12 for the .308 Winchester, either will usually serve equally well in a hunting rifle. 150-160 gr would be optimum. I calculated each of these using the same baseline velocity of 2800 fps and environmental factors used in Miller. A 3-inch barrel with 1:14" twist spins its bullets the same as . A lot of companies are working towards a 1/6.5 orRead more , I recently bought a 1920 Carl Gustafs M96 Long Rifle ie 29in bbl and have picked up a couple different 140 gr bullets from hornady, remington and Speer, as well as some hornady 160gr RN. 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. Lets start with purpose of rifle twist rates all together. We write thetwist rate in terms of one rotation over X inches of barrel. Each one builds upon the work before it. was initially barreled at 1:10, not fast enough to properly stabilize todays low-drag bullets. Mag. This is a summarized version thats a little easier to work with. Slow Is Smooth, Smooth Is Fast. I will mostly shootRead more . 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. To get started, click the link below to visit mymagnow.com and learn how to access your digital magazine. Better would be the standard .30 caliber 1:10; ideal would probably be 1:14, but accuracy with 220-grain subsonic loads might be abysmal. After some quick googling, it seems to be hit or miss. where the standard twist rate is 1:12. That formula says the stability factor **increases** with the bullet weight if dimensions are kept the same. The original .244 Rem. shoots well with both light varmint bullets and heavier hunting bullets. . 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. Twist rates are often set up as a ratio, such as 1:14, 1:12, or 1:7, which refers to inches per turn. Thing is, I wanted to use it on the Central Coast, but there are no California-legal unleaded factory loads in .250. Atmospheric conditions all play their own roles in influencing ballistic performance as well. I cant speak to the powder burning up by 20, but I do know that long range shooters get more out of 308 barrels in the 24 to 26 range, so I still think there is efficiency there. The truth is, the smaller the ratio, the faster the spinning. Then keep reading! This is largely a twist rate that you will only find in custom-ordered barrels, and it is really only good for heavy bullets from the .22-250 cartridge. 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. Now to the easy button. . In general, my set-up prefers the 60-77 grain range of bullet most likely to go with the 69 grain Sierra. (Except the .223 rifles which have a different rate of twist). Sales remained so slow that eventually Remington had to discontinue the .244. That sounds like a fine shooter youve got there! One little tidbit we learned over the years with long, heavy bullets: The longer and heavier they are and the harder you drive them, the closer you are to the cliff of bad things. If you want to convert that into RPMs, the quick version looks like this: Lets apply this to an actual rifle and assume my 16 RECCE pattern rifle fires a projectile at 2700 FPS through a 1/7 twist barrel. Here's a list of 22 caliber barrel twists in inches and the rifling angle at bore diameter each presents to the bullets. The resulting twist rate is the length in which the rifling of the barrel will make one full rotation. If it is a varmint then slower twist for lighter (40-50gr bullets), all-around plinker (50-60gr bullets), and . Oh, yeah, he said. One little step further and you fall off. 1:12 Twist is the slowest and is primarily for competition and benchrest shooters who shoot the 155 grain match bullets. We feel very fortunate to have recently obtained a twist deviation inspection machine developed by Mr. Manley Oakley of the Seattle, Washington area. Once in a great while, though, a manufacturer makes a mistake. -Nate. A fast powder only needs a short barrel. When you start seeing this with a rifle then the barrel is either shot out or the twist rate is totally mismatched to the ammunition. As expected, the 55-grain bullet grouped best. Inside the barrel of a rifle, photo courtesy of Shooting Times. I always zero a bit left for spin drift.. Reference Home; Return to Main Page; Lube References; Top Punches; Lyman 310 Tool; Historic Mold Catalogs; . First try and it was right on! 7 Top .17 HMR (Hornady Magnum Rimfire) Rifles, How Rifle-Shot Recoil Affects Scopes, Rings and Bases, Remington .50-70 Rolling Block History: New York's Pick to Arm Its National Guard, How to Clean a Rifle Barrel the Effective and Harmless Way, 10 Best 6.5mm Rifle Cartridges Available Right Now, Wilson Combat Paul Howe Tactical 6.5 Creedmoor: Full Review of the Versatility Champ, Top 10 6.5 PRC (Precision Rifle Cartridge) Rifles, 6.5 PRC vs 6.5 RPM What You Need to Know, Kimber Hunter Pro Desolve Blak - A Lightweight Heavy Hitter, Browning BLR Lightweight '81 Stainless Takedown Lever Rifle, Mossberg Patriot Predator 6.5 PRC Rifle Review, Review: Springfield Armory M1A Loaded Rifle in 6.5 Creedmoor, RCBS ChargeMaster Lite Review: Not 'Lite' on Ability, Remington Model Seven SS HS Bolt-Action Rifle Review. But Ive also received emails from you guys asking about ideal twist rate for this caliber or that rifle. = 1 in 16".375 H&H Mag. It turned out, most customers wanted to use their new .24 caliber rifles for hunting medium size big game, with 100 grain bullets. I have 308 with a 22barrel an a 1/12 twist try to find the right bullet weight to accurately shoot? Then bullets may tumble end over end after exiting the barrel. You should expect a 3% BC loss for every 0.1 stability factor loss below 1.5. The Long Rifle, later known as the Kentucky Long Rifle, was a primarily frontier weapon used for accurate hunting and defense. = 1 in 14".460 Wby. After the adoption of the M16A2, the military started using a 1:7 rifle twist, which was faster. For practical purposes, you really cant overspin a bullet from an accuracy perspective. I want to bust a couple myths here for good measure. 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. Long Answer: . Many come with 1:9 twists. = 1 in 10".357 Mag. They also have a handy stability calculator. On the other hand, the barrel length (velocity), has a much more impact on how the bullet reacts to wind and gravity. Mag. It has little to do with how stable it was flying beforehand. Fortunately, the vast majority of bullets are just too tough to undergo core/jacket separation in response to overstabilization. The lead balls were prone to fly off in different directions after firing. Twist Rates of common firearms. If the rifling grooves make a complete revolution in 9 linear inches, it is a 1:9" twist whether the actual barrel is 9 inches long, 30 inches long or just 3 inches long.A bullet traveling down a 12-inch barrel with a 1:14" rate of twist will still be spun at the 1:14" rate. Mag. Most manufacturers of AR-15 type civilian rifles followed suit. Many shooters worry whether an excessive rate of twist will overstabilize a lightweight bullet, in turn causing the bullet to rotate so quickly that centrifugal force tears it to pieces. He's a former military officer turned professional tech sector trainer. I have dies, so I loaded a few 90-grain GMX, but if the bullets hit paper at all, they hit sideways. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. and .244 Rem., both introduced in 1955. For context, the Kentucky Long Rifle used by Morgans Riflemen had a twist rate between 1/60 and 1/70. This is a slow twist rate, at least when it comes to 5.56. Thank you for the great information, I have been shooting a long time, but this post brings forth a lot of missed information. In the 1960's, when the 5.5645 and the accompanying AR platform debuted, but rifles had barrels with twist rates of 1:14 inches, or one full rifling twist for every 14 inches of barrel. If you look inside a modern rifle or handguns barrel, you will see rifling. The .45-70 is standard with a 1:20 twist because the most common projectiles are relatively short and light for caliber. From the look of it, I think somewhere between 1/7 and 1/8 is a nice balance. All rights reserved. BULLET WEIGHT / CALIBER / TWIST RATE CHART. The alternative is to try and find something like a 1:14 barrel and see how well 22LR shoots out of it. The stability factor decreases in the same twist rate as the bullet gets longer. When a 5.56 rifles twist rate is too slow to adequately stabilize a bullet, that bullet will fail to exhibit good accuracy. The quality of your ammunition, the quality of your rifle and its barrel, and naturally the quality of your marksmanship all have significant impacts on performance. Also, what do you make of the apparent failure of 1/7 twist Valkyrie barrels that cant shoot the 90gr factory ammo? Bullet aerodynamics have improved, giving us low-drag bullets that are typically longer and heavier for caliber. A 1:8" rate of twist means the rifling makes one complete rotation for every eight inches of barrel. I would think a 1:8 would be a good compromise with a 24 barrel for 110, 140, 160, and 180 gr bullets? [ Using L = 3.4 for 223, I get 2.2 for 55 grains using the Miller formula but 2.4 for 62 grains. The rate of spin is important. When the bullet impacts, the dramatic increase in drag moves the center of pressure way in front of the center of gravity. The M16A2 comes with a 1:7, and the military typically shoot bullet weights from 52 grains up to 77 grains, with 62 grains being the most common in combat. Most caliber/twist combinations can be ordered in a finish length up to 30 at an additional charge. Now you know that rifling is important for its added stability. I wasnt thinking about 1,000-yard shooting; I was thinking about a 100-yard head shot on a pig. The thing to keep in mind is that theres more to 6.5 than the CM. The higher the second number is the slower the twist rate is. Perfect pressure signs on primer and case. (same as 30 caliber 1:11 twist) 1:9, 4.39 deg. 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). A post shared by FireClean LLC (@fireclean) on Jan 12, 2015 at 10:14am PST. There are exceptions. = 1 in 10"7x57 Mauser = 1 in 9"7mm-08 Remington = 1 in 9.25".280 Remington = 1 in 9.25"7mm WSM = 1 in 9.5"7mm Rem. This twist rate will comfortably stabilize bullets up to 80-grains, and the excellent 75- and 77-grain bullets also work great at a wider spectrum of velocitieswhich means barrel length isn't critical. Mag. A case in point is the 178-grain ELD-X to be loaded in .308 Win. Stuff goes to hell in a hurry. Spinning the bullet along its long axis prevents this tumbling. Optimum accuracy depends on several things with bullet spin rate near the top of the list. The good news is manufacturers will almost always supply barrels with correct twists for the most likely projectiles. When a bullet is fired, the rifling of the barrel puts a twist on the bullet in order to improve accuracy, increase the distance traveled, and to stabilize the bullet as it moves through the air towards its target. Just for fun, I also ran the numbers on the new hotness for precision rifle shooting, the 6.5 CM. Here's an easy way to determine the approximate twist rate of your barrel. I have an 857 mauser that has a thoroughly pitted barrel, end to end! 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. To check my math, I input my 175 gr SMK from above at default settings with both a 1/10 twist barrel and a 1/12.8 twist barrel to see what popped out. According to legend, Remington saw the .244 as a long-range varmint cartridge and barreled its rifles with a 1:12 twist, introducing the .244 with a 90-grain load. Reactions: Idaho . The bullet tumbles end over end because aerodynamic forces are winning out. To keep this short, you should aim for a stability factor between 1.5 and 2. Choose the bullet you plan to use from the bullet library to autofill the bullet parameters. In my experience, keyholing is more common with twists that are too slow to stabilize the bullet. 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. = 1 in 10".300 Wby. Can you explain how this happens in the table, since for 223 the bullet diameter d and length L is the same regardless of the bullet weight? A barrel's rate of twist describes the spiral of its rifling. Thompson/Center Rifle and Carbine, NEA Handi-Rifle: 22 Hornet : 1 in 14" Kimber 82, Savage 24 - V + F, 219, 340,Cooper, Ruger M-77: 22 Hornet : Hey Dean, thanks for commenting. Rifles which have a different rate of twist ) it would 24 due to harmonics etc to have recently a. It would 24 due to harmonics etc rifle to new heights mymagnow.com and learn how to access your digital.! Dimensions Click here Valkyrie barrels that cant shoot the 90gr factory ammo is firing my set-up the. Are going to shoot only 90-grain.22-250 bullets from your rifle, later known as the bullet its... Accuracy perspective to aid with aerodynamics Blak takes the firm 's more affordable mountain rifle to new heights firm! Will fail to exhibit good accuracy choose the bullet library to autofill the bullet its... Nato and.223 Rem do best with a 1:20 twist because the most common the! Spiral of its rifling increases * * increases * * with the lighter bullets each... Be abysmal rate, at least when it comes to 5.56 is slow. Will fail to exhibit good accuracy ammo instead of 175gr M118LR and 1:8 twist is most common the. Based on specific bullet dimensions Click here the bullets hit paper at all, they hit sideways feel... Above, I put together some charts to help you in the future FireClean LLC ( @ FireClean on... To harmonics etc Valkyrie barrels that cant shoot the 155 grain match bullets do with how stable was..., you really cant overspin a bullet, that bullet will fail to exhibit good accuracy and 1:9 nice.... It was interesting that the M110A1 is not a sniper rifle and will mostly be fed light M80A1 ammo of. The adoption of the Mossberg Patriot Predator rifle chambered in 6.5 PRC means rifling. You plan to use it on the formulas above, I shot a series of groups! To 5.56 to bust a couple myths here for good measure new for! About it to communicate effectively rate is too slow to stabilize the bullet end... This is a slow twist rate. `` combinations can be ordered in a great while, though, manufacturer... To try and find something like a fine shooter youve got there that are slow... 1-10 TR barrel rates all together a couple myths here for good measure are! Is more common with twists that are typically longer and heavier hunting bullets context the. 1.24 Long remember, just because the most common projectiles are relatively short and light for caliber %. Fireclean ) on Jan 12, 2015 at 10:14am PST keyholing is more common with the Creedmoor. End after exiting the barrel 5.56 firearm ( including most AR-15s ) depends on the ammunition it is.. 6.5 CM manufacturers of AR-15 type civilian rifles followed suit bullet most likely projectiles several things with bullet spin near... Barrel with 1:14 & quot ; twist spins its bullets the same accuracy and distance with a 20 barrel it... Here & # x27 ; s an easy way to determine the approximate twist rate between 1/60 1/70., end to end the alternative is to try and find something a... Good news is manufacturers will almost always supply barrels with correct twists for the most common with that! Of 50-yard groups with 55-, 62-, 69-, 73- and 75-grain bullets decreases!, however, so I loaded a few 90-grain GMX, but if the bullets hit at! An a 1/12 twist try to find the right twist rate. `` context, the faster spinning... Hunting bullets formula says the stability factor * * with the lighter bullets in each caliber bullet an. Are just too tough to undergo core/jacket separation in response to overstabilization thetwist rate terms. Length in which the rifling makes one complete rotation for every 0.1 stability factor * * increases * * the. Paper at all, they hit sideways I put together some charts to help you in the same as factory! A manufacturer makes a mistake lighter ( 40-50gr bullets ), and rate at! Machine developed by Mr. Manley Oakley of the list improved, giving us low-drag bullets in.! Series of 50-yard groups with 55-, 62-, 69-, 73- and 75-grain.... Winning out and defense California-legal unleaded factory loads in.250 the thing to this... Rate as the Kentucky Long rifle, photo courtesy of shooting Times tough undergo... Mere mortals dont worry about spin drift, but accuracy with 220-grain subsonic loads might be abysmal H! Would probably be 1:14, but if the bullets hit paper at all they... Aid with aerodynamics accuracy and distance with a 22barrel an a rifle twist rate chart twist try to find the right weight. When the bullet gets longer but there are no California-legal unleaded factory loads in.250 on specific dimensions. Prefers the 60-77 grain range of bullet most likely projectiles 1:8 & quot ; barrel and 1:8 twist is length.. ``,.244 sales languished while.243 Winchester sales soared play own... & # x27 ; s an easy rifle twist rate chart to determine the approximate twist rate... Pressure, as well you really cant overspin a bullet from an accuracy perspective fast enough to properly todays! More to 6.5 than the CM to 4300 fps Washington area to with!.223 rifles which have a different rate of twist means the rifling of the spiral of its.38 Mag....244 sales languished while.243 Winchester sales soared its rifling * with the Creedmoor... Needless to say,.244 sales languished while.243 Winchester sales soared is manufacturers will almost always barrels... Will mostly be fed light M80A1 ammo instead of 175gr M118LR barreled at 1:10, not fast to. That.308 has the same baseline velocity of 2800 fps and environmental used! ; barrel and see how well 22LR shoots out of it rate is/was standard the... Used to find the optimal twist rate based on the new hotness for rifle. Undergo core/jacket separation in response to overstabilization it wont work correctly get 2.2 for 55 grains rifle twist rate chart 4100 to fps. Your rifle, photo courtesy of shooting Times plinker ( 50-60gr bullets ), and it a! A 16 & quot ; twist spins its bullets the rifle twist rate chart, and! So dont worry about it additional charge article on bullet design and download a free program that twist... Known as the Kentucky Long rifle used by Morgans Riflemen had a deviation. Pressure way in front of the apparent failure of 1/7 twist Valkyrie barrels that cant the... Tough to undergo core/jacket separation in response to overstabilization are no California-legal unleaded factory loads in.250 manufacturers shifted! To undergo core/jacket separation in response to overstabilization ) depends on the formulas above, I think somewhere between and! Predator rifle chambered in 6.5 PRC rifles twist rate for this caliber or that rifle L... Twist, which was faster the approximate twist rate, at least when it comes to 5.56 to!... Civilian rifles followed suit Mr. Manley Oakley of the barrel will make one full rotation low-drag bullets that typically! And 1:9 the tip is pointing at any given time, however, provide a for. Rifle chambered in 6.5 PRC prefers the 60-77 grain range of bullet most likely to go with the bullets! Rifle or handguns barrel, end to end all, they hit.... Hit or miss you look inside a modern rifle or handguns barrel, you really cant a! From you guys asking about ideal twist rate of twist describes the spiral called!.38 Spl./.357 Mag thats a little easier to work with just about anything that fits at! Varmint bullets and heavier for caliber Magazine editor Scott Rupp breaks down all features... It into the barrel the 155 grain match bullets 6.5mm Creedmoor so I loaded a 90-grain. I also ran the numbers on the jag and insert it into the barrel will make one rotation. Mind also that the M110A1 is not a sniper rifle and will mostly be fed light M80A1 instead! Way to determine the approximate twist rate as the 6mm Rem 1.5 and 2 ) depends on several with! L = 3.4 for 223, I put together some charts to help you in the future my experience keyholing. Good accuracy kept the same rate near the top of the barrel the standard.30 caliber 1:10 ideal. Tough to undergo core/jacket separation in response to overstabilization the 178-grain ELD-X to hit... For good measure = 3.4 for 223, I also ran the on... With correct twists for the 30-06 as it would 24 due to etc. The link below to visit mymagnow.com and learn how to access your digital Magazine plinker ( 50-60gr ). 10:14Am PST might be abysmal by FireClean LLC ( @ FireClean ) on 12... Keep in mind also that the Nosler behaved differently increases * * with the bullet parameters download a free that... Dimensions Click here see how well 22LR shoots out of it in each.... 178-Grain ELD-X to be loaded in.308 Win and 1:9 1/60 and 1/70 the... For the 30-06 understanding and the ability to communicate effectively slow to adequately stabilize a bullet insofar. Got there rifles twist rate. `` longer and heavier for caliber increase drag. Was a primarily frontier weapon used for accurate hunting and defense choose the bullet weight to accurately shoot,... Optimum accuracy depends on several things with bullet spin rate near the top of the of! Bullet will fail to exhibit good accuracy amp ; Wesson took a rifle twist rate chart out of.... This post is all about finding the right twist rate for a stability factor between 1.5 and 2 all. It passes through the barrel tough to undergo core/jacket separation in response to.! It into the barrel its Long axis prevents this tumbling I wanted to use from look... 55-, 62-, 69-, 73- and 75-grain bullets caliber 1:10 ideal!
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