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Rifles, Reloading, Optics, Equipment
Reloading
powder charge vrs barrel length
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<blockquote data-quote="Bart B" data-source="post: 837355" data-attributes="member: 5302"><p>I believe that a good load will have uniform pressure curves so the muzzle velocity spread's small regardless of barrel length. Therefore, I don't think there would be any difference in accuracy. But trajectory's will be flatter with longer barrels. Of course the barrels will whip and vibrate differently but each one's repeatable for each shot in the frequencies and amplitude they have. As long at that happens, it doesn't matter when the bullet leaves the barrel; 22 or 28 inches from the bolt face.</p><p></p><p>Proof of this to me is folks shooting Federal Gold Medal .308 Win. match ammo in N14NM rifles' 22 inch barrels as well as bolt action match rifles with 28 inch barrels. Both produce the same accuracy level at 600 yards; about 2/3 MOA at worst. If I'd not seen this done in a 600 yard match, I would not have believed it. Later proved it to myself by shooting my own lot of that ammo type in a borrowed M14NM and my 28" barreled match rifle. Both had 1:11 twists and virtually the same bore and groove dimensions within 1/10,000th inch.</p><p></p><p>Rusty Rick, you'll get a much better idea of accuracy with those loads shooting one 15-shot group with each load. If you shoot five 3-shot groups and they're not all within 10% of the same size, they don't reflect what the real accuracy they have is. You can shoot five 3-shot groups on each of 5 targets laid over another one to capture all 15 shots. Doing this usually surprises folks when they see each of their five 3-shot groups being smaller than the 15-shot composite.</p></blockquote><p></p>
[QUOTE="Bart B, post: 837355, member: 5302"] I believe that a good load will have uniform pressure curves so the muzzle velocity spread's small regardless of barrel length. Therefore, I don't think there would be any difference in accuracy. But trajectory's will be flatter with longer barrels. Of course the barrels will whip and vibrate differently but each one's repeatable for each shot in the frequencies and amplitude they have. As long at that happens, it doesn't matter when the bullet leaves the barrel; 22 or 28 inches from the bolt face. Proof of this to me is folks shooting Federal Gold Medal .308 Win. match ammo in N14NM rifles' 22 inch barrels as well as bolt action match rifles with 28 inch barrels. Both produce the same accuracy level at 600 yards; about 2/3 MOA at worst. If I'd not seen this done in a 600 yard match, I would not have believed it. Later proved it to myself by shooting my own lot of that ammo type in a borrowed M14NM and my 28" barreled match rifle. Both had 1:11 twists and virtually the same bore and groove dimensions within 1/10,000th inch. Rusty Rick, you'll get a much better idea of accuracy with those loads shooting one 15-shot group with each load. If you shoot five 3-shot groups and they're not all within 10% of the same size, they don't reflect what the real accuracy they have is. You can shoot five 3-shot groups on each of 5 targets laid over another one to capture all 15 shots. Doing this usually surprises folks when they see each of their five 3-shot groups being smaller than the 15-shot composite. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
powder charge vrs barrel length
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