Best way to check max pressure with your 50BMG, when you fire a round, rechamber that fired case and if there is any noticable resistance when you close the bolt, your to high in pressure.
The 50 BMG is designed for 50-55K PSI. As such, if your loading hot enough to expand the case enough it will not rechamber easily, your loading to hot.
Is this the max performance the 50 can get, certainly not, but this is where its designed to be loaded to and generally shoots the best in this range as well.
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