InterestingJMG. Your experience with NATO surplus is what I hope I can massage out my PC10. I am not supper experienced with bolt guns and all the science of bore pressure and such. I have some time with FN's and M1A's. The M1A had some trouble with the cheap tula stuff which seemed a little hot. I added a adjustable gas plug and that seemed to help. My DSA 58 FAL has never missed a beat, ever. I need a bolt gun that gives me the confidence of the FN. A buddy recommended to start with a Savage and I trust him implicitly, but he reloads perfectly, and that may be why he has never had trouble. Thanks for your interest.