Taper crimp is necessary for reliability. When I reloaded for the 52-2 I trimmed the brass to minimum length, and left the bullet lead about .0010 exposed. Be sure to full length re-size as a portion of the rear of the case is not supported in a semi-auto, and a slight bulge can develop in fired cases. If not fully re-sized, this may cause sticking in the chamber or occasionally a round not going fully into battery.

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H Richard
SWCA1967 SWHF244