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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Understanding cartridge efficiency
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<blockquote data-quote="antelopedundee" data-source="post: 1916255" data-attributes="member: 107384"><p>Changing case shape gets you nowhere as far as increased velocity goes When Ackley "improved" the 6.5-06 he not only changed the shape, but he increased capacity too. The QL shows that the 6.5-06 case holds 60.46 grains of water while the 6.5-06AI case holds 65.53 grains of water. Had he wanted to keep case capacity the same he would have set the shoulder back some. His only option to increase case capacity was to change the shape. This allowed a little extra velocity by using more of the same or a slower powder. His opinion was that maximum efficiency was reached with the parent case. Of course with all of the newer powders the 6.5-06AI has gained a measure of popularity. Had he had them available his conclusion may have been different.</p></blockquote><p></p>
[QUOTE="antelopedundee, post: 1916255, member: 107384"] Changing case shape gets you nowhere as far as increased velocity goes When Ackley "improved" the 6.5-06 he not only changed the shape, but he increased capacity too. The QL shows that the 6.5-06 case holds 60.46 grains of water while the 6.5-06AI case holds 65.53 grains of water. Had he wanted to keep case capacity the same he would have set the shoulder back some. His only option to increase case capacity was to change the shape. This allowed a little extra velocity by using more of the same or a slower powder. His opinion was that maximum efficiency was reached with the parent case. Of course with all of the newer powders the 6.5-06AI has gained a measure of popularity. Had he had them available his conclusion may have been different. [/QUOTE]
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Understanding cartridge efficiency
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