I fully concur with previous posters on the pressure limit with these rifles. All I can think of as a cause of your problem would be a rough chamber, excessive headspace, or the chamber has a defect, providing it is not the ammo. I have seen my share of rough chambers on milsurps. Anytime, I have doubts, I always make a chamber cast and slug the bore. You can find plenty of info on both slugging and casting the chamber on the forums.
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