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Message: <blockquote data-quote="PrairieGhost" data-source="post: 228482" data-attributes="member: 704"><p>The standard deviation I was wondering about was your velocities.  After trying crimp dies and noticing an increase in velocity, but a loss in accuracy with all my rifles except an AR15 I stopped using the crimp dies.  The AR15 shot much better with crimped bullets.  So if crimping did it I started looking at neck thickness and velocity.  I measured brass and shot three shot groups with tight necks and three shot groups with turned necks.  My velocity dropped slightly with the turned necks, but my groups shrunk considerably.  The standard deviation improved slightly.  I noticed it most in my 308 which went from a 50 fps spread to a 10 to 15 fps spread.</p></blockquote><p></p>

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