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Varmint Hunting
223 Ackley Improved
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<blockquote data-quote="Kevin Thomas" data-source="post: 470858" data-attributes="member: 15748"><p>Sounds a bit optimistic to me, since the "improvement" in the 223 isn't all that great. You're already dealing with a case with fairly minimal body taper and a reasonably sharp shoulder. In 223 match rifles, 2,750 with the 77s is already moving pretty good and flirting with pressures. I ran this one (223 AI) out on Quickload with both a 22" and 26" barrel, and went from 2,800, on up to about 2,900 fps. That was with the cyber-pressures running at absolute max, and I doubt I'd be pushing a real rifle quite that hard. Especially when it was my face behind the bolt, if you get my drift.</p><p> </p><p>If you want 3,000-3,100 fps out of the 75s, I'd say a bigger case is in order, not just a longer barrel.</p></blockquote><p></p>
[QUOTE="Kevin Thomas, post: 470858, member: 15748"] Sounds a bit optimistic to me, since the "improvement" in the 223 isn't all that great. You're already dealing with a case with fairly minimal body taper and a reasonably sharp shoulder. In 223 match rifles, 2,750 with the 77s is already moving pretty good and flirting with pressures. I ran this one (223 AI) out on Quickload with both a 22" and 26" barrel, and went from 2,800, on up to about 2,900 fps. That was with the cyber-pressures running at absolute max, and I doubt I'd be pushing a real rifle quite that hard. Especially when it was my face behind the bolt, if you get my drift. If you want 3,000-3,100 fps out of the 75s, I'd say a bigger case is in order, not just a longer barrel. [/QUOTE]
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