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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
School me on case design..
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<blockquote data-quote="Bart B" data-source="post: 618426" data-attributes="member: 5302"><p>Jim asks me: Burning powder escaping around the bullet as it enters the rifling acts like a cutting torch. It removes metal at the origin of the rifling. When that gets eroded away too much, the first thing noticed is a drop in muzzle velocity, then accuracy goes bad.</p></blockquote><p></p><p>Two of 'em burn much more powder pushing out heavier bullets. And those two move the rifle around more while the bullet's going down the barrel. It's the recoil you don't feel while this happens that moves the barrel axis around a little bit.</p><p></p><p>As the .270 is a little more overbore than the .30-06, it has a slight accuracy disadvantage.</p><p>[/QUOTE]</p>
[QUOTE="Bart B, post: 618426, member: 5302"] Jim asks me: Burning powder escaping around the bullet as it enters the rifling acts like a cutting torch. It removes metal at the origin of the rifling. When that gets eroded away too much, the first thing noticed is a drop in muzzle velocity, then accuracy goes bad.[/QUOTE] Two of 'em burn much more powder pushing out heavier bullets. And those two move the rifle around more while the bullet's going down the barrel. It's the recoil you don't feel while this happens that moves the barrel axis around a little bit. As the .270 is a little more overbore than the .30-06, it has a slight accuracy disadvantage. [/QUOTE]
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School me on case design..
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