January 12th, 2017, 06:57 AM
Join Date: Jul 2015
It has to be your reloads, pressure signs from Factory Loads are not all that uncommon, for example: Flattened Primers, I have seen this with Federal Loads in both my bolt and semi-auto guns.
Do you measure each powder load individually? What kind of press are you using?
I had a similar problem when I was using a Lee Turret Press. It was flexing, unbeknownst to me due to a base pin that was backing out, which meant that the shoulder was not always set back properly and that the rounds were not concentric. When I went back to to my RCBS press, the problems went away.