No that is not a common problem AFAIK.
Only time I had something like that happen was when I had some gunk around the neck area of the chamber and each shot was higher pressure. Did you check the head space and clean the barrel before the first shot ??
What did the case head look like ?? Look like high pressure ??
Maybe you have a bad chamber, IE a burr or something like that.
What did the side of the cases look like. Any heavy scratches down the side etc ??
Could also be a tight neck I guess. IE you shoot it and carbon build up causes slightly higher pressure with each shot
but 5 shot is short for that.
Did you clean the barrel between the FMJ rounds and the core lock rounds ??
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