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Old October 3, 2012, 07:26 AM   #18
Nathan
Senior Member
 
Join Date: July 1, 2001
Posts: 1,838
I would measure the diameter of 10 bullets. Maybe something is off there.

I've picked up a lot of Glock 40 S&W brass. It never had the square mark as far as I know. It did have drag marks and your drag marks are about right for a max or near max load. Maybe the square marks are the next level of hot. Also, Glock's are famous for oversized chambers. Maybe it is time for a chamber cast.

Last, the crack seems to have stopped where the brass was "Glocked". . .weird.
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