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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
308 bullet questions
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<blockquote data-quote="Bart B" data-source="post: 620325" data-attributes="member: 5302"><p>With a 1:10 twist, you'll probably get best accuracy with bullets heavier than 190 grains. I say this because when the .308 was "the" cartridge to use in high power competition, a 1:11 twist was about perfect for 190's with max loads. And a 1:12 was about perfect for 168's and 180's as well as 175's. 1:13's the one to use with 150's and 155's. shot at faster speeds.</p><p></p><p>Spinning bullets too fast typically causes accuracy to suffer. As all bullets are unbalanced to some degree, the best match ones are close to, but not quite, perfectly balanced. Uneven jacket thickness, core position and outside profile all vary a tiny amount. So spin bullets just fast enough to stabilize them all the way to the target.</p><p></p><p>So, with that barrel, use Sierra 200's and maybe 220's with a case packed full of IMR4350 at about 48 grains for the 200 and 47 for the 220. I'd bet these will be the most accurate.</p></blockquote><p></p>
[QUOTE="Bart B, post: 620325, member: 5302"] With a 1:10 twist, you'll probably get best accuracy with bullets heavier than 190 grains. I say this because when the .308 was "the" cartridge to use in high power competition, a 1:11 twist was about perfect for 190's with max loads. And a 1:12 was about perfect for 168's and 180's as well as 175's. 1:13's the one to use with 150's and 155's. shot at faster speeds. Spinning bullets too fast typically causes accuracy to suffer. As all bullets are unbalanced to some degree, the best match ones are close to, but not quite, perfectly balanced. Uneven jacket thickness, core position and outside profile all vary a tiny amount. So spin bullets just fast enough to stabilize them all the way to the target. So, with that barrel, use Sierra 200's and maybe 220's with a case packed full of IMR4350 at about 48 grains for the 200 and 47 for the 220. I'd bet these will be the most accurate. [/QUOTE]
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308 bullet questions
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