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Originally Posted by bossman
I had one load of 45acp down lower than I wanted and one set of 9mm plated push 1200 fps, yikes. Great shooting round and very accurate but my gun would eject the brass to the next county. I thought they may be a little warm but found they're just hot. Next batch will be about 3gr lighter and will see how they work for accuracy.
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Just to make sure, you do understand that velocity is proportional to average pressure in the bore and not the peak pressure. So it can't tell you if the pressure is safe. Moreover, even if it could, its not that hard of circumstances to make a chronograph read off by 50 fps. Fine for comparing SD's and duplicating your own test load, but not accurate enough to be sure your peak pressure matches some other gun's peak pressure with the same velocity even using the same powder.