AA9 200gn

[10 Round]

I need some thought here. I just undid all of my one eighty grain ten millimeter with a a seven I just reset up ten millimeter 200gn grain with aa9 9 shots.
12.4 grains of AA9 should be in the 1100's with a 200 grain bullet. My average was 1350, no apparent bulging, no bad primers.
Definitely, had to hold on shot Great. What did I do wrong.

[10 Round]

Just recheck nosler and hornady nosler #9, 12.4 max and hornady 8, goes higher for max.
Just recheck powder charge twice 12.4 and 12.3.

[10 Round]

I just dropped it down two 11.6 grains of AA9 still average 1300fps

[The_Shadow]

Be careful as some other Hornady manuals were wrong for 10mm as they showed the grain weights for AA#7 which was way too hot.

Also the newer AA#9 is much better than the older formulations on the early years.  I have seen probably 5 different formulations and I have posted that here on the forum.

The older AA#9 I had was 100% microbeads and max loads were compressed to which it would push the seated bullet back out.  It also produced one of the flattest primers in my test with 140 grain Barnes TAC-XP.
12.6 grains of AA#9 (had to adjust powder shoving the bullet back out 1.270")(Totally compressed @ 12.6 gr.) @ 1181 fps, Primer was totally flattened to the edges. It penetrated 5" of sandy dirt and the bullet failed to open, partially folded in on itself. Case expanded to 0.4280"
See photo.


AA#9 Microbead formulation

[10 Round]

Okay little update
I poured out all of the powder and burned it. replaced all of the powder and Reset the powder dropper. I ran a few dummy rounds. Install the new battery in the conograph reloaded a few test rounds, and they were all book value. Not sure what I did wrong the first time but they were hot.