I was looking through some of my old reloading manuals and rediscovered some data that Hornady published to show the effects of primer selection, case volume, powder moisture, etc. The pressures were in CUP, and I was a little surprised at how much variability there was in the pressures of 5-shot strings using identical loads in the same chamber. One extreme spread was over 6,000 CUP.
It occurs to me that this is due both to the variability in the actual pressure and also to the variability in the copper crushers used to measure the pressures.
Do any of you have similar data on the extreme spreads of pressures measured with electronic systems? I am wondering if it is smaller. Or, are the electronically-measured peak pressures even more variable than the amounts that the copper cylinder get crushed?
SL1
It occurs to me that this is due both to the variability in the actual pressure and also to the variability in the copper crushers used to measure the pressures.
Do any of you have similar data on the extreme spreads of pressures measured with electronic systems? I am wondering if it is smaller. Or, are the electronically-measured peak pressures even more variable than the amounts that the copper cylinder get crushed?
SL1