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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some advice on new barrel
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<blockquote data-quote="Bart B" data-source="post: 510853" data-attributes="member: 5302"><p>I think a 1:10 inch twist is way too fast for 180's out of a .300 WSM. Back when 30 caliber magnums were "the only way to go" for long range competition, 1:12 twist barrels were the best for 190 and 200 grain bullets. Spinning bullets too fast is one sure way to get fliers way out of your group when a bullet's unbalance is above average. 1:10 twists are for 220-gr. bullets from that cartridge.</p><p></p><p>I had a worn out Palma rifle barrel's back end cut off to make it 27 inches long then rechambered for .300 Win. Mag. It's 1:13 inch twist shot Sierra 180-gr. HPMK's into 2/3 MOA at 1000 yards with ease. Those bullets spun about 171,000 rpm leaving the barrel; just about perfect for that bullet.</p><p></p><p>If you'll only shoot 180's, a 1:13 (or maybe a 1:12, for milder loads) twist's hard to beat from a .300 WSM.</p></blockquote><p></p>
[QUOTE="Bart B, post: 510853, member: 5302"] I think a 1:10 inch twist is way too fast for 180's out of a .300 WSM. Back when 30 caliber magnums were "the only way to go" for long range competition, 1:12 twist barrels were the best for 190 and 200 grain bullets. Spinning bullets too fast is one sure way to get fliers way out of your group when a bullet's unbalance is above average. 1:10 twists are for 220-gr. bullets from that cartridge. I had a worn out Palma rifle barrel's back end cut off to make it 27 inches long then rechambered for .300 Win. Mag. It's 1:13 inch twist shot Sierra 180-gr. HPMK's into 2/3 MOA at 1000 yards with ease. Those bullets spun about 171,000 rpm leaving the barrel; just about perfect for that bullet. If you'll only shoot 180's, a 1:13 (or maybe a 1:12, for milder loads) twist's hard to beat from a .300 WSM. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need some advice on new barrel
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