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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity vs accuracy in long range shooting
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<blockquote data-quote="Bart B" data-source="post: 679828" data-attributes="member: 5302"><p>The big difference in barrels is their length. They gotta be long enough to shoot 180-gr. and heavier bullets fast enough to remain supersonic at long ranges. </p><p></p><p>In the 1960's, the US Army Rifle Team replaced the 172-gr. match bullet in M118 7.62 NATO match ammo with a Western 180 gr. FMJ match bullet or a Sierra 180 HPMK bullet; sometimes adding a half grain of powder to what was already used for the 172 grain ones. They shot it in their M14NM's 22 inch barrel winning lots of matches and setting records, too. That was a stout load but the M14NM's handled it very well.</p><p></p><p>Folks have shot 200 grain match bullets from 26 inch .308 Win. barrels with a 1:11 twist and 220's with a 1:10 twist; winning matches and setting records doing it. David Tubb used a 28 inch long 1:8 twist barrel shooting Sierra 250-gr. match bullets out at 2150 fps; they were still supersonic through 1000 yards and shot sub MOA test groups at that range.</p></blockquote><p></p>
[QUOTE="Bart B, post: 679828, member: 5302"] The big difference in barrels is their length. They gotta be long enough to shoot 180-gr. and heavier bullets fast enough to remain supersonic at long ranges. In the 1960's, the US Army Rifle Team replaced the 172-gr. match bullet in M118 7.62 NATO match ammo with a Western 180 gr. FMJ match bullet or a Sierra 180 HPMK bullet; sometimes adding a half grain of powder to what was already used for the 172 grain ones. They shot it in their M14NM's 22 inch barrel winning lots of matches and setting records, too. That was a stout load but the M14NM's handled it very well. Folks have shot 200 grain match bullets from 26 inch .308 Win. barrels with a 1:11 twist and 220's with a 1:10 twist; winning matches and setting records doing it. David Tubb used a 28 inch long 1:8 twist barrel shooting Sierra 250-gr. match bullets out at 2150 fps; they were still supersonic through 1000 yards and shot sub MOA test groups at that range. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
velocity vs accuracy in long range shooting
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