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22-250 AI Savage Axis

 
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Old 04-07-2013, 05:45 PM
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Join Date: Jun 2010
Location: greenwood, IN
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Re: 22-250 AI Savage Axis

OK we gota a 22-250 Ackley improved case and want to compair it with the generic 22-250. Ackley designed the case to reduce brass flow in a case that was already border line overbore. His design was to be able to shoot a factory 22-250 round in the improved chamber, and thus form the improved case. Sounds real good on paper, but it don't work that way. When you fireform that case your moving a lot metal around in the chamber. The biggest movement will be in the shoulders and by doing so the neck becomes the weakest link. The necks will shrinking about .040" or more on a neck that is barely good enough. Best way to form these case is out of .243 brass, and you'll still .030" of shrinkage. I have seen 22-250AI chambers show .062" of case shrinkage. An already too short cannot work well with this. (even .035"). A better design would have been with a 1.46" shoulder length and a 30 degree shoulder angle. Use a 1.90" over all length with the standard .010" taper per inch. You'll have a greater barrel life without much difference in velocity because the bullet's not seated into the shoulder area with the bigger heavier bullets. Of course the folks that have never done a false shoulder will have trouble at first, but the end results will make the end users happier. You'll see far less of the dreaded doughnut, have better gas flow and probably a 30% or more greater barrel life. One thing I didn't touch on here is that they seem to have a neck splitting problem during fire forming. I have never seen this, but buddies of mine that built them did. These rifles were all done by Dwight Scott, and you don't see better workmanship in the gun world.
gary
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