I've used AA#7 in 45auto, 9mm, 357mag and 30-30 with cast boolits. I always keep AA#7 on hand since it's a little faster than #9 it tends to work better in my 3" SP-101 (357mag). And after discovering the joy of shooting cast boolits in the 30-30 with "pistol powders", AA#7 has become my favorite just slightly edging out A-2400 and Unique. I use more AA#9 than anything else, but I always have the AA powders 2,5,7 and 9 on hand ... more so now since Alliant powders (specifically Unique and A-2400) are very scarce.
So, I'm another fan of AA#7
jd