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Long Range Hunting & Shooting
1000 yds...Next step?
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<blockquote data-quote="Bart B" data-source="post: 659318" data-attributes="member: 5302"><p>The .308's track record in competition's been with Varget and IMR4895 with 155's. IMR4064 for bullets from 160 up to 190 grains and IMR4350 with 200 up through 250. The US Army Rifle Team used IMR3031 with Sierra 168's for a while but it shot no better than IMR4064 and it was a lot dirtier; barrels had to be cleaned more often. Barrel lengths don't seem to matter; accuracy's been equal with lengths from 22 to 28 inches as long as the muzzle velocity's high enough for the distance shot at. For example, Federal's .308 Win. match ammo with 168 HPMK's shot equally well from 22 inch M14/M1A barrels, 24 inch Garand barrels and 24 or 26 inch bolt action match rifle barrels; under 4 inches at 600 yards in properly built rifles.</p><p></p><p>I don't think you'll need a chronograph to check you loads' muzzle velocity. Use what I suggested but start a couple grains under and watch pressure. The lot of primers will probably be the biggest variable in accuracy. I suggest the Wolff large rifle ones as they're a favorite in competition 'cause they typically produce the best accuracy and have little lot to lot differences.</p></blockquote><p></p>
[QUOTE="Bart B, post: 659318, member: 5302"] The .308's track record in competition's been with Varget and IMR4895 with 155's. IMR4064 for bullets from 160 up to 190 grains and IMR4350 with 200 up through 250. The US Army Rifle Team used IMR3031 with Sierra 168's for a while but it shot no better than IMR4064 and it was a lot dirtier; barrels had to be cleaned more often. Barrel lengths don't seem to matter; accuracy's been equal with lengths from 22 to 28 inches as long as the muzzle velocity's high enough for the distance shot at. For example, Federal's .308 Win. match ammo with 168 HPMK's shot equally well from 22 inch M14/M1A barrels, 24 inch Garand barrels and 24 or 26 inch bolt action match rifle barrels; under 4 inches at 600 yards in properly built rifles. I don't think you'll need a chronograph to check you loads' muzzle velocity. Use what I suggested but start a couple grains under and watch pressure. The lot of primers will probably be the biggest variable in accuracy. I suggest the Wolff large rifle ones as they're a favorite in competition 'cause they typically produce the best accuracy and have little lot to lot differences. [/QUOTE]
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