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Old September 28, 2012, 09:51 PM   #5
1stmar
Senior Member
 
Join Date: March 21, 2012
Location: Connecticut
Posts: 1,067
You always get that rectangular mark on the primers? If the marks on the case didnt come from the chamber it may be coming from the inside of magazine. You may want to remove the spring and clean the inside of the mag. I believe glocks use a polygonal barrel, 4.7 gr is max load, you may get higher pressure in a polygonal bore. I think the primers show signs of high pressure. the split case could be from pressure or a combination of pressure and whatever is causing that wear mark. I'm guessing it's pressure.
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