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How Much Crimp Is Too Much?


cottyw

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How much crimp is too much? My KKM barrel likes allot of crimp and occasionally I get a flier. I pulled a couple of bullets and they have a noticeable indent but the plating is not separating from the bullet. If I don’t give the bullets a heavy crimp the gun doesn’t function reliably.

Will

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What caliber? Have several KKM's in various glocks and have never had this sort of problem with Berry's or WC plated? Own are sized as per Brian's method on his Video: case looks like an "Hour-Glass" once seated and crimped. All am really doing is removing the bell and insuring they all will case-gauge in an EGW hand-reamed guage.

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Somewhere close to bullet diameter , plus 2X the brass wall thickness , minus .001 - .002 has worked well for me.

Most brass runs .010 or so.

.400 + 2X .010 = .420

I crimp .418 - .419 ( measured at the absolute edge of the case )

Just .02

Travis F.

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