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264 win mag
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<blockquote data-quote="Bart B" data-source="post: 340803" data-attributes="member: 5302"><p>My first 1000-yard bullseye target rifle was chambered for the .264 Win. Mag in the mid 1960's. Three Douglas barrels were air gaged and the one with the most uniform groove dimensions was selected. It was chamberd with a standard SAAMI reamer and finished 28 inches long.</p><p></p><p>Norma was the only outfit making known-good 6.5mm match bullets. I was given 8 boxes of their 139-gr. FMJ nickel plated boattail bullets. Tried IMR4831, IMR4350 and H870 powders with Win. 120 primers. Fired one 15-shot group with each powder at Sierra's max load recommendation. H870 produced the only 1 MOA group and the others were near 2 MOA; all three at 1000 yards. Estimated muzzle velocity was 3250 by Sierra's head ballistic tech. He also said I'd be lucky if that barrel went 600 rounds of accurate life.</p><p></p><p>Won some matches with that load and it was somewhat mild in recoil, but with a 13-pound rifle that's normal.</p><p></p><p>Sierra Bullets gave me 2 boxes of their prototype 140-gr. .264 HPMK bullets to test, so I shot three 15-shot test groups with them. Smallest one was about 25 inches at 1000 yards. Gave the rest back to Sierra mentioning they didn't shoot very well. Sierra said they couldn't get 'em to shoot well either. (It was near 20 years later before Sierra made really good 6.5mm match bullets.)</p><p></p><p>That barrel died instantly at about 650 rounds; went from shooting 1/2 MOA at 600 yards to 4 MOA in two shots.</p></blockquote><p></p>
[QUOTE="Bart B, post: 340803, member: 5302"] My first 1000-yard bullseye target rifle was chambered for the .264 Win. Mag in the mid 1960's. Three Douglas barrels were air gaged and the one with the most uniform groove dimensions was selected. It was chamberd with a standard SAAMI reamer and finished 28 inches long. Norma was the only outfit making known-good 6.5mm match bullets. I was given 8 boxes of their 139-gr. FMJ nickel plated boattail bullets. Tried IMR4831, IMR4350 and H870 powders with Win. 120 primers. Fired one 15-shot group with each powder at Sierra's max load recommendation. H870 produced the only 1 MOA group and the others were near 2 MOA; all three at 1000 yards. Estimated muzzle velocity was 3250 by Sierra's head ballistic tech. He also said I'd be lucky if that barrel went 600 rounds of accurate life. Won some matches with that load and it was somewhat mild in recoil, but with a 13-pound rifle that's normal. Sierra Bullets gave me 2 boxes of their prototype 140-gr. .264 HPMK bullets to test, so I shot three 15-shot test groups with them. Smallest one was about 25 inches at 1000 yards. Gave the rest back to Sierra mentioning they didn't shoot very well. Sierra said they couldn't get 'em to shoot well either. (It was near 20 years later before Sierra made really good 6.5mm match bullets.) That barrel died instantly at about 650 rounds; went from shooting 1/2 MOA at 600 yards to 4 MOA in two shots. [/QUOTE]
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