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Old July 4, 2012, 05:21 PM   #8
m&p45acp10+1
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Join Date: May 3, 2009
Location: Central Texas
Posts: 3,307
Try turning the sizing die down in half turn increments, and skip the crimping. See if they chamber easily. Note do not use the Collet Neck Sizing die with a semi auto. All rounds for semi Auto must be FL resized.

With the turing the die down till the rounds chamber easily. Now take a batch to the range uncrimped. Fire one round extrac the next round do this with 5 rounds. Measure the extracted rounds. If they measure to within +/- .002 skip crimping. If they are longer then crimping may be needed.
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