As far as powders go, I've used 2400 and Blue Dot under 158g SWC. I haven't used any AA#7.
Found good loads in each. Found both of these loads good in 'my' revolvers.
8.5g of Blue Dot gets you 1162fps out of 6 1/2" barrel
13.5g of 2400 gets you 1270fps out of 6 1/2" barrel
Should be obvious, but these loads work for 'me'. Best to work up your own loads to see what you like.
My current goto load is 5.5g Green Dot for 1071fps as I have no need for barn-burner loads. I don't need noise, blast, and recoil for general purpose loads.... Beauty of reloading.
Oh,
MJFlores, was that target shot at 25Y, 50Y? Just curious.