I have used quite a bit of it in .45acp and 9mm. Nice powder, and since it is bulky, if you double charge a case it spills out. It burns fairly clean, but not as clean as others, and not as dirty as others. It is one of my fav's, although I can't always find it.
It`s not a powder that I use because there are other powders of about the same burn rate that I prefer. I do how ever use several of the other Accurate Arms powders and have found them to be very good powders if they are the burn rate your looking for.
Great powder. All Accurate powders are great. I use #2,5,7,9 & 4100 in the various calibers I reload. very fine ball powders that meter well and exhibit low flash. Go to their web site and download their free reloading manual.
AA#5 was designed to be the ideal powder for .45acp. Works well in other applications as well. I just today put together some .38 target loads, using AA#2=2.9gr. under Speer 148HBWC. Similar burn rate as Bullseye, and usually a couple of $ less per pound.