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Velocity is no indication of Pressure.
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Oh, yes it is
. With a given powder, the higher the velocity, there is more pressure. Period. Yes a 'different' powder may give you less pressure for same velocity. Need to compare apples to apples. You are right though, you should never just add powder to get listed velocity, because your gun is different from the test gun. Might put you over pressure if working at the 'high end'. I agree with that
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Another thing that is nice with a chrono, is you can test the same load with different primers. I found this very helpful for example when I did a bunch of Trail Boss testing awhile back with some surprising results. Anyway... I won't be without one now.