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Long Range Hunting & Shooting
243 ackley
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<blockquote data-quote="sambo3006" data-source="post: 973460" data-attributes="member: 2740"><p>BWB,</p><p>Perhaps I came off a little harsh with my comments but I was concerned that the original poster could be led to load to very high pressures to reach a 200+ fps velocity gain. According to John Barsness and other sources as well, generally velocity percentage increase is about 1/4 of the percentage of case capacity gain. For the 243 Ackley this would translate to about a 2% velocity gain and for the 6mm Ackley a 3% velocity gain.</p><p></p><p>There may be something to the fact that you haven't compared velocity of a barrel first chambered in the standard round and then rechambered to the Ackley round, but I still think that you are probably operating at chamber pressures a fair amount higher than SAAMI max pressures for the parent cartridge. As long as your bolt lift isn't hard, probably not high enough pressure to stress the action but I just wanted to enlighten you on the facts as I have been informed.</p><p></p><p></p><p>Good shooting!</p><p></p><p>Sam</p></blockquote><p></p>
[QUOTE="sambo3006, post: 973460, member: 2740"] BWB, Perhaps I came off a little harsh with my comments but I was concerned that the original poster could be led to load to very high pressures to reach a 200+ fps velocity gain. According to John Barsness and other sources as well, generally velocity percentage increase is about 1/4 of the percentage of case capacity gain. For the 243 Ackley this would translate to about a 2% velocity gain and for the 6mm Ackley a 3% velocity gain. There may be something to the fact that you haven't compared velocity of a barrel first chambered in the standard round and then rechambered to the Ackley round, but I still think that you are probably operating at chamber pressures a fair amount higher than SAAMI max pressures for the parent cartridge. As long as your bolt lift isn't hard, probably not high enough pressure to stress the action but I just wanted to enlighten you on the facts as I have been informed. Good shooting! Sam [/QUOTE]
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243 ackley
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