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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
what is the rate of twist
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<blockquote data-quote="Fiftydriver" data-source="post: 37080" data-attributes="member: 10"><p>Jarhead,</p><p></p><p>Your advice I am afraid is about the exact opposite of what is the actual case. If your rifle will not shoot the 180's because of improper bullet stability, then I would say you have a 1-12 twist.</p><p></p><p>May just be a case that your rifle does not like the 180 gr bullet you tested.</p><p></p><p>The generaly rule here is that lighter bullets will shoot accurately with a slower twist.</p><p></p><p>For example, a 150 gr .308 bullet will generally shoot very accurately out of a 1-14 twist.</p><p></p><p>The 165 gr bullets will need a 1-12 to shoot well on averge.</p><p></p><p>The 180 to 200 will generally need a 1-11.</p><p></p><p>The 200 to 220 gr pills will need around a 1-10.</p><p></p><p>The big 240 to 250 gr bullets will need a 1-8 to 1-9 twist.</p><p></p><p>This is all dependent on velocity as this effects bullet RPM dramatically. It is really RPM that stabilizes bullets so velocity can help you get by with slightly slower twists but it is smart on average to get a little more spin the is required, especially if you will be hunting in colder weather where velocities may drop off a little.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 37080, member: 10"] Jarhead, Your advice I am afraid is about the exact opposite of what is the actual case. If your rifle will not shoot the 180's because of improper bullet stability, then I would say you have a 1-12 twist. May just be a case that your rifle does not like the 180 gr bullet you tested. The generaly rule here is that lighter bullets will shoot accurately with a slower twist. For example, a 150 gr .308 bullet will generally shoot very accurately out of a 1-14 twist. The 165 gr bullets will need a 1-12 to shoot well on averge. The 180 to 200 will generally need a 1-11. The 200 to 220 gr pills will need around a 1-10. The big 240 to 250 gr bullets will need a 1-8 to 1-9 twist. This is all dependent on velocity as this effects bullet RPM dramatically. It is really RPM that stabilizes bullets so velocity can help you get by with slightly slower twists but it is smart on average to get a little more spin the is required, especially if you will be hunting in colder weather where velocities may drop off a little. Good Shooting!! Kirby Allen(50) [/QUOTE]
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what is the rate of twist
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