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The Range
Rifle & Shotgun Discussion
Barrel Twist Question
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<blockquote data-quote="KurtM" data-source="post: 1074570" data-attributes="member: 6064"><p>Alrighty...I know many folks have thoughts on barrel twist, but this is what I have found. The orriginal M-16 had a 1X14 twist and it stablized 55 grain bullets ok but in very cold weather it wouldn't stabalize the tracer bullet. So the twist was changed to 1X12 and this stabalized all 55 gr bullets in all weather. Then out came the 62 grain bullets like the SS109 and M855, now these wouldn't stabalize in a 1X12, but did really good in a 1X9....BUT the pesky tracer again wouldn't stabalize unless it was twisted MUCH faster...1X7, so that became the NATO standard....just to stabalize the tracer! Now what does this all mean?</p><p></p><p>Well the 1X9 does just great with a 69gr bullet, and it will usually do just fine with anything that can be loaded and fed from a magazine, to include the 75 and 77 grain bullets, but not every barrel will like them. Now this DOES NOT mean that the bullet will key hole or "tumble" it just might not be as accurate as it would with a lighter bullet. For instance I have a couple 1X9s that shoot 77s into 1 M.O.A. I have another that will shoot sub M.O.A. with 69s but 75/77s open up to 2 M.O.A. Now 2 M.O.A. is just fine for hog shooting, so you would be just fine using anything heavier that can be loaded into a magazine.</p><p></p><p>As for "needing" a 1X7 to shoot 77s and 80s, this just isn't true! The 1X8 twist is perfect for these bullet weights. Heck even the Mk 12 rifles run a 1X8 barrel and they were designed around the Mk 262 77gr round. No you don't need a 1x7 to shoot heavies, and depending on the barrel you might not even need 1X8. I had a Rem 700 with a 1X12 that would shoot 69 grain bullets into an inch at 200. Velocity plays a big part in how well a bullet stabalizes in a given twist so if you have a slower twist you need as much speed as you can for a heavier bullet. Borrow a few heavies for someone and try them, I bet they will do just fine for Hogs!</p></blockquote><p></p>
[QUOTE="KurtM, post: 1074570, member: 6064"] Alrighty...I know many folks have thoughts on barrel twist, but this is what I have found. The orriginal M-16 had a 1X14 twist and it stablized 55 grain bullets ok but in very cold weather it wouldn't stabalize the tracer bullet. So the twist was changed to 1X12 and this stabalized all 55 gr bullets in all weather. Then out came the 62 grain bullets like the SS109 and M855, now these wouldn't stabalize in a 1X12, but did really good in a 1X9....BUT the pesky tracer again wouldn't stabalize unless it was twisted MUCH faster...1X7, so that became the NATO standard....just to stabalize the tracer! Now what does this all mean? Well the 1X9 does just great with a 69gr bullet, and it will usually do just fine with anything that can be loaded and fed from a magazine, to include the 75 and 77 grain bullets, but not every barrel will like them. Now this DOES NOT mean that the bullet will key hole or "tumble" it just might not be as accurate as it would with a lighter bullet. For instance I have a couple 1X9s that shoot 77s into 1 M.O.A. I have another that will shoot sub M.O.A. with 69s but 75/77s open up to 2 M.O.A. Now 2 M.O.A. is just fine for hog shooting, so you would be just fine using anything heavier that can be loaded into a magazine. As for "needing" a 1X7 to shoot 77s and 80s, this just isn't true! The 1X8 twist is perfect for these bullet weights. Heck even the Mk 12 rifles run a 1X8 barrel and they were designed around the Mk 262 77gr round. No you don't need a 1x7 to shoot heavies, and depending on the barrel you might not even need 1X8. I had a Rem 700 with a 1X12 that would shoot 69 grain bullets into an inch at 200. Velocity plays a big part in how well a bullet stabalizes in a given twist so if you have a slower twist you need as much speed as you can for a heavier bullet. Borrow a few heavies for someone and try them, I bet they will do just fine for Hogs! [/QUOTE]
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