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View Poll Results: Should we consider copper solids for maximum effect on large varmints
Do I need a longer barrel? 2 33.33%
Should I use more case capacity? 1 16.67%
Should I go up in bullet weight? 3 50.00%
Should I be using lighter bullets, or sabots ? 3 50.00%
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Old 02-10-2011, 07:30 PM
steelshooting steelshooting is offline
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Join Date: Nov 2010
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Default .17 Hyper velocity 4,000 fps + = Hydraulic jelly

These urls will take you to articles about P.O.Ackley, solid copper projectiles, effects on armor plate and shoulder bones.
Cajun Blake10-22-2009, 09:26 PM
Here are 2 great reads that I copy/paste to detail PO Ackley's findings.

If you are a reloader and don't have his 2 Vol set of books , I suggest you get it b

article 1 :
P.O. Ackley, the godfather of American ballisticians, forgot more than most of us will ever know about bullet performance. Many years ago, I read his double volume “Handbook for Shooters & Reloaders.” When I turned to his chapter entitled “Killing Power” in Volume I, I fully expected a treatise on why .50-caliber bullets are more deadly than .49-caliber bullets. However, I was amazed to fine something different – something that Ackley called “shockdown power” rather than “knockdown power.”

His premise is simply that the more speed increases, the more shock increases. And when speed passes the threshold of 4,000 feet per second, a whole new dynamic is created – one that cannot be equaled with lesser speed, no matter how large the bullet.

His classic test, which proved his point, was conducted by shooting bullets into ½-inch-thick steel-armor plate from the frontal area of a U.S. military half-track. At a distance of 30 feet, he shot a .270 Win with 100-grain bullets, a .30-06 with military-issue, solid-steel, armor-piercing bullets, and a .220 Swift with a 48-grain bullet.

The results were astounding. The .270 bullet left a shiny spot on the armor plate and did not penetrate at all. Two shots from the .30-06 armor-piercing bullets left shallow craters .070 and .098 inch respectively. The little .220 Swift bullets consistently burned 3/8-inch diameter holes completely through the ½-inch armor. The results spoke for themselves. Crossing the threshold of hypervelocity created a dynamic as a result of shock that cannot be achieved any other way.

Ackley’s test was done on armor plate, but how does that translate to performance on the flesh and bone of wild animals? Ackley went on to say that if he had to pick only one rifle for hunting North American game, it would be a .220 Swift. If, in Ackley’s day, he had had access to the slower-burning powders of today, he would have been able to propel even larger-diameter bullets at “hyperspeed” – bullets traveling 4,000 or more feet per second at the muzzle. I speculate that he would have chosen a larger-caliber, heavier bullet capable of hyperspeed for his choice North American game rifle.

rest of article (great read) :
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17 & 19 grn copper, cnc copper solid, hypervelocity

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