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Hunting
Long Range Hunting & Shooting
Thoughts on 22 and 6mm PRC
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<blockquote data-quote="357Mag" data-source="post: 1813603" data-attributes="member: 106883"><p>All -</p><p></p><p>Homer Powley's " Expansion Ratio " chart seen in the " Guns & Ammo 1974 Annual " listed ER's using 28" barrel length; as a reference point ( all listed calibres / case capacities ).</p><p></p><p>Consulting the chart:</p><p>A notional .224" cal wildcat that could hold 72gr of an appropriate powder, would have an expansion ratio of 4 in a 28" barrel. Homer did not even bother to list ER's lower than 4. I'd surmise, because of gross internal ballistics inefficiencies ( in this instance ) presented by a notional .224" caliber wildcat @ that case capacity level.</p><p></p><p>For the same barrel length, a 6mm wildcat could hold a tad more powder than 72gr; IF considering a 28" barrel length.... and willing to run right up to the Expansion Ratio </p><p>4 threshold. </p><p></p><p>Bullet wt selection might be biased to make max use out of such case capacities in the 2 calibres mentioned; none-the-less...... bullet wt differences won't change the rifle's built-in ER.</p><p></p><p></p><p>With regards,</p><p> 357Mag</p></blockquote><p></p>
[QUOTE="357Mag, post: 1813603, member: 106883"] All - Homer Powley's " Expansion Ratio " chart seen in the " Guns & Ammo 1974 Annual " listed ER's using 28" barrel length; as a reference point ( all listed calibres / case capacities ). Consulting the chart: A notional .224" cal wildcat that could hold 72gr of an appropriate powder, would have an expansion ratio of 4 in a 28" barrel. Homer did not even bother to list ER's lower than 4. I'd surmise, because of gross internal ballistics inefficiencies ( in this instance ) presented by a notional .224" caliber wildcat @ that case capacity level. For the same barrel length, a 6mm wildcat could hold a tad more powder than 72gr; IF considering a 28" barrel length.... and willing to run right up to the Expansion Ratio 4 threshold. Bullet wt selection might be biased to make max use out of such case capacities in the 2 calibres mentioned; none-the-less...... bullet wt differences won't change the rifle's built-in ER. With regards, 357Mag [/QUOTE]
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Thoughts on 22 and 6mm PRC
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