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Old December 1, 2012, 08:02 PM   #15
m&p45acp10+1
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Join Date: May 3, 2009
Location: Central Texas
Posts: 3,310
I would suggest if using the collet die to also use the dead length seating die as well. It has made more of a difference in my groups than the sizing die did. Though I give a slight edge in group size to the collet die my a slight margin.

I tested seating dies using an RCBS seating die. With, and without crimp, and using the Lee dead length seating die. The seater made a 1/4 inch difference using five shot groups at 100 yards.
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