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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What is the most overbore cartridge YOU HAVE USED?
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<blockquote data-quote="hemiford" data-source="post: 3075286" data-attributes="member: 72104"><p>In my opinion, not enough attention is paid to Expansion Ratio.</p><p></p><p>I think a better, more equal, way to compare external ballistics is:</p><p></p><p>Powder Load / Barrel Volume</p><p>where barrel volume = bore squared x barrel length x Pi/4</p><p></p><p>This gives results most shooters have not seen.</p><p></p><p>As an example, comparing the ratios of 30-06 charge/barrel vol with 30-378</p><p>charge/barrel vol, if you use a 22-in barrel for a 30-06, the same expansion ratio</p><p>in a 30-378 yields about a 44-in barrel requirement.</p><p></p><p>Nobody builds a 30-378 that way, so in my opinion, the 30-378 never gets a fair comparison.</p><p></p><p>This is only one example.</p><p></p><p>***EDIT***</p><p>I think this is Internal ballistics, not external ballistics.</p></blockquote><p></p>
[QUOTE="hemiford, post: 3075286, member: 72104"] In my opinion, not enough attention is paid to Expansion Ratio. I think a better, more equal, way to compare external ballistics is: Powder Load / Barrel Volume where barrel volume = bore squared x barrel length x Pi/4 This gives results most shooters have not seen. As an example, comparing the ratios of 30-06 charge/barrel vol with 30-378 charge/barrel vol, if you use a 22-in barrel for a 30-06, the same expansion ratio in a 30-378 yields about a 44-in barrel requirement. Nobody builds a 30-378 that way, so in my opinion, the 30-378 never gets a fair comparison. This is only one example. ***EDIT*** I think this is Internal ballistics, not external ballistics. [/QUOTE]
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What is the most overbore cartridge YOU HAVE USED?
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