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Old February 11, 2013, 11:33 AM   #19
Clark
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Join Date: December 4, 1999
Location: WA, the ever blue state
Posts: 4,678
Compressing powder is something I have done.
For real hard compression, I put a pin gauge in a collet bullet puller die.
I do that because a bullet would yield under that much pressure and expand in diameter.
The powder may then expand the brass from hard compression.
So I resize the loaded ammo.
The cartridge must be able to fall into and fall out of the chamber or a huge pressure spike will result.

But even with a hardened steel pin gauge, AA#9 [a ball powder] is not going to compress enough to notice.

800X is flakes and it will compress over 50%.
AA#9 is little balls, and it will not compress enough for me to measure.
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