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Clark · June 5, 2001, 08:57 PM

When I was working up loads for the 147 gr 9x19mm, I tried AA#9 and H110. When it came to compressing the powder, they would not compress. The bullet would flatten out by several thousands of and inch. The nose of the bullet would flatten.
The hollow point would close up.

This is in contrast to many other pistol powders that I double compressed. That is, I filled the 9mm case up, seated a bullet in a bullet puller, and unseated the bullet. There was then room in the case to put in more powder. The real bullet was then seated in a second press.

So, AA#9 can be some tough stuff to compress.

June 5, 2001, 08:57 PM	#3
Clark Senior Member Join Date: December 4, 1999 Location: WA, the ever blue state Posts: 4,678	When I was working up loads for the 147 gr 9x19mm, I tried AA#9 and H110. When it came to compressing the powder, they would not compress. The bullet would flatten out by several thousands of and inch. The nose of the bullet would flatten. The hollow point would close up. This is in contrast to many other pistol powders that I double compressed. That is, I filled the 9mm case up, seated a bullet in a bullet puller, and unseated the bullet. There was then room in the case to put in more powder. The real bullet was then seated in a second press. So, AA#9 can be some tough stuff to compress.