I had a question about .308 overpressure. I always load below specs. I loaded some 168 grain Barnes Match Burners for use in a PSA .308, with 44 grains of Vithavouri N-135 powder, and according to the specs this was one grain under max. Using Win. primers and IMI brass. Thought it would be fine. Went to the range, and not until ten rounds did I notice the primers came right out of their pockets, the case base was distorted so much I could not use them to reload and needless to say I stopped and pulled the rest. I wrote Vithivouri and they said their specs were for a bolt action 24 inch rifle with a flat based bullet, and a boat tail would produce drastically different pressures. Can anyone tell me what went on, in general, and what I can do to have this not happen again? Ever. LOL! I have read seven reloading manuals before, have reloaded for years, and nowhere did I ever read that the shape of the bullet itself would produce such a drastic difference. I did find that 39 grains showed no signs of overpressure, but I won't go any higher than that. Tom.