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Hunting
Long Range Hunting & Shooting
6.5 saum or 7mm saum
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<blockquote data-quote="cheechin" data-source="post: 1461600" data-attributes="member: 106286"><p>The more powder burned for a given caliber, the less barrel life it has.</p><p></p><p>Did a study of Sierra Bullets test barrels and those of top ranked competitors for barrel life. For best accuracy, all caliber's lives were about 3000 rounds when charge weight in grains had the same number as bore cross section area in square millimeters; bore capacity. Double the charge weight and lives were one fourth as much, 750 rounds. Increase charge weight by 1.4 times and barrel life is 1500 rounds; half as much. Example, 308 Win has bore area and capacity of about 46 and 3000 round barrel life. 300 Wby Mag burning 92 grains of powder, 750 rounds of match barrel life. </p><p></p><p>The standard for match grade barrels was 1/4 MOA average groups at short range when new, then opening up to 3/8 MOA average. Hunting barrels start at 3/4 to 1 MOA then die at 1-1/2 to 2-1/2 MOA around 6000 rounds. Service rifles twice the group sizes as that of hunting ones, 9000 round lives.</p><p></p><p>Hotter burning powders give 10% to 15% less life than cooler ones.</p><p></p><p>I'd pick the 7mm Rem SAUM as the best compromise.</p></blockquote><p></p>
[QUOTE="cheechin, post: 1461600, member: 106286"] The more powder burned for a given caliber, the less barrel life it has. Did a study of Sierra Bullets test barrels and those of top ranked competitors for barrel life. For best accuracy, all caliber's lives were about 3000 rounds when charge weight in grains had the same number as bore cross section area in square millimeters; bore capacity. Double the charge weight and lives were one fourth as much, 750 rounds. Increase charge weight by 1.4 times and barrel life is 1500 rounds; half as much. Example, 308 Win has bore area and capacity of about 46 and 3000 round barrel life. 300 Wby Mag burning 92 grains of powder, 750 rounds of match barrel life. The standard for match grade barrels was 1/4 MOA average groups at short range when new, then opening up to 3/8 MOA average. Hunting barrels start at 3/4 to 1 MOA then die at 1-1/2 to 2-1/2 MOA around 6000 rounds. Service rifles twice the group sizes as that of hunting ones, 9000 round lives. Hotter burning powders give 10% to 15% less life than cooler ones. I'd pick the 7mm Rem SAUM as the best compromise. [/QUOTE]
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6.5 saum or 7mm saum
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