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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Balance in bore diameter???
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<blockquote data-quote="Bart B" data-source="post: 104699" data-attributes="member: 5302"><p>[ QUOTE ]</p><p>What barrel length are you using for those Bore capacity figures?</p><p></p><p>So are you saying my 257 AM(95 gr powder charge) and my 7mm AM(107 gr powder charge) are a bit overbore?? /ubbthreads/images/graemlins/blush.gif /ubbthreads/images/graemlins/grin.gif</p><p></p><p>For pure accuracy and longest barrel life combinations I would tend to agree with your numbers for the most part.</p><p></p><p>[/ QUOTE ]Barrel length didn't matter for this 'bore capacity' stuff. As barrels typically wear out from the throat forward from highest pressure and powder burning temperatures, that's where it came from and was/is based on barrel life. What 'efficiency' rating one gives a barrel for a given powder's charge weight vs bore diameter AND bore length may well be something else. But there are typically a narrow range of powder makes/types that tend to give best accuracy for a given bullet weight. And there's another range of powder makes/types that produce the highest muzzle velocity. Sometimes these two are the same.</p><p></p><p>No, I'm not saying your two cartridges are a bit over bore. If I did say they were, I would use a word meaning a lot more than 'bit.' That aside, sometimes one chooses to go a humungus amount of over bore capacity to get the muzzle velocity desired for a given caliber's bullet weight. It's sometimes been said that a given caliber is accurate for a given amount of powder. Shooting more powder per shot means you'll run out of powder (wear out your barrel) faster.</p><p></p><p>Regarding barrel life, it's much like religion, life partners, politics and sex. Whatever makes you feel the best is what you're gonna go with. We all have different personal standards and opinions.</p></blockquote><p></p>
[QUOTE="Bart B, post: 104699, member: 5302"] [ QUOTE ] What barrel length are you using for those Bore capacity figures? So are you saying my 257 AM(95 gr powder charge) and my 7mm AM(107 gr powder charge) are a bit overbore?? [img]/ubbthreads/images/graemlins/blush.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img] For pure accuracy and longest barrel life combinations I would tend to agree with your numbers for the most part. [/ QUOTE ]Barrel length didn't matter for this 'bore capacity' stuff. As barrels typically wear out from the throat forward from highest pressure and powder burning temperatures, that's where it came from and was/is based on barrel life. What 'efficiency' rating one gives a barrel for a given powder's charge weight vs bore diameter AND bore length may well be something else. But there are typically a narrow range of powder makes/types that tend to give best accuracy for a given bullet weight. And there's another range of powder makes/types that produce the highest muzzle velocity. Sometimes these two are the same. No, I'm not saying your two cartridges are a bit over bore. If I did say they were, I would use a word meaning a lot more than 'bit.' That aside, sometimes one chooses to go a humungus amount of over bore capacity to get the muzzle velocity desired for a given caliber's bullet weight. It's sometimes been said that a given caliber is accurate for a given amount of powder. Shooting more powder per shot means you'll run out of powder (wear out your barrel) faster. Regarding barrel life, it's much like religion, life partners, politics and sex. Whatever makes you feel the best is what you're gonna go with. We all have different personal standards and opinions. [/QUOTE]
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Balance in bore diameter???
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