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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: 617886" data-attributes="member: 5302"><p>In the world of super accuracy with rifled barrels at ranges up to 600 yards, the cartridges that make 'em shoot so darned accurate are typically short and fat. That is, they put as much powder as possible as close to the primer as possible. End result's a more uniform push on the bullet so they all leave at the same speed; or as close as possible.</p><p></p><p>Another very important thing is, the most accurate cartridge cases typically hold one grain of powder for each square millimeter of the bore's cross sectional area. Examples; .222 Rem. .22 PPC, .22BR, 6mmBR, 6mm PPC and 30 BR And in close second places to these are the 6XC and .308 Win. The 22 caliber ones do fine up to 300 yards but beyond that, it's best to use one of the 6mm's or the .308. </p><p></p><p>Any case that holds more powder is considered by many to be overbore. And these just don't shoot all that accurate...in general. Yes, there's exceptions. But the best odds desired means you'll pick one of the ones listed above. Of the three you mention, the .243 and 6mm Rem barrels will last about one third as long as the 6x47. And with the 6x47's lower recoil levels, it'll be easier to shoot accurately too.</p></blockquote><p></p>
[QUOTE="Bart B, post: 617886, member: 5302"] In the world of super accuracy with rifled barrels at ranges up to 600 yards, the cartridges that make 'em shoot so darned accurate are typically short and fat. That is, they put as much powder as possible as close to the primer as possible. End result's a more uniform push on the bullet so they all leave at the same speed; or as close as possible. Another very important thing is, the most accurate cartridge cases typically hold one grain of powder for each square millimeter of the bore's cross sectional area. Examples; .222 Rem. .22 PPC, .22BR, 6mmBR, 6mm PPC and 30 BR And in close second places to these are the 6XC and .308 Win. The 22 caliber ones do fine up to 300 yards but beyond that, it's best to use one of the 6mm's or the .308. Any case that holds more powder is considered by many to be overbore. And these just don't shoot all that accurate...in general. Yes, there's exceptions. But the best odds desired means you'll pick one of the ones listed above. Of the three you mention, the .243 and 6mm Rem barrels will last about one third as long as the 6x47. And with the 6x47's lower recoil levels, it'll be easier to shoot accurately too. [/QUOTE]
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School me on case design..
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