Model 12's are also chambered in 22-250, which have a SAAMI chamber pressure of 65,000CUP which is about the highest CUP they list. I think the PPC has a case head of .445" which means a 7.62x39 bolt head should work. If you don't mind me asking, why the PPC? Why not the 6mm BR? OR keep your action as is and go with 6mm/223?
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