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Old October 16, 2012, 11:30 AM   #12
Nathan
Senior Member
 
Join Date: July 1, 2001
Posts: 1,977
It looks like your firing pin is dragging some on the primer. I DO find this to be pressure related. The gun is functioning faster than the firing pin can get out of the way. I consider your reading about max pressure in my XD, but my 1911 does not do this regardless of pressure. It could also be a weak firing pin spring. Also, the shape of the dimple in the primer can be a pressure sign. The firing pin dimple should have a nice round bottom.

Also, rested accuracy is a measure of pressure. When pressure gets too high accuracy usually accuracy goes south.

Last, keep within the manual limits for like bullets and you should be close.

BTW, you should be setting OAL on what feeds, passes the plunk test, etc. Manual OAL's are a "how did they get this max load" number. Don't just copy the manual OAL.
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