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Old July 15, 2012, 09:11 PM   #17
rebs
Senior Member
 
Join Date: January 10, 2012
Posts: 2,196
What I found is that I had a great under 1" group when using CCI # 400 primers, the local gun shop was out of the CCI primers and I bought 200 Federal's to hold me over. With nothing changed except the primer my groups opened up to 3" with the federal's. I went back to the CCI 400's when they got them in and my groups went right back to under 1"
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