Quote:
Originally Posted by Riverpigusmc
^this. Pressure in a firearm is measured in CUP (copper units of pressure). Some powders are meant to be compressed, most are not. Some powders are position sensitive (i.e. if they lay along the bottom of the case, ignition will suffer). Some powders characteristics are such that free space causes pressure spikes. In that case, OAL is reduced, or fillers are used. That is why loading manuals always list minimum and maximum overall length for each bullet and powder combination
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I never thought about the powder laying along the bottom of the case. Now ya really got me going....some of this comes from a round, any caliber, being chambered over and over, lowering the OAL and then the round damaging the gun upon firing.
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CBOB0716
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