I used to use APP. I have gone back to real Goex Black Powder, about a year ago. I will just let you know about my experiance with APP, and leave the debate about subs, and real blck powder for another time. APP is a clean burning powder. It had decent ignition in my percussion MLs, however, I was using musket caps, not #11 caps. It had unreliable ignition in my flintlocks. It felt like it had less recoil, and muzzle blast, when compared to equal amounts of black powder. I do not have a chrony, but I suspect it produces less velocity. I noticed this shooting at the range, and using it right out of the can. If left exposed to the air, it definately looses power. I left a load in my ML for a couple of days during a past hunting season, and went to shoot it out, to put a fresh load in, and it was noticably weak. I would not use it for hunting anymore. Cleanup of APP was the same as any other powder I have used. Bucket of warm soapy water, and thourough rinse. Like I said, I use Goex now.