I have wanted to try it but I live in an area where it is hard to find. Here's a review about American Pioneer Powder I found on "Modern Muzzleloader":

http://www.modernmuzzleloader.com/phpBB/viewtopic.php?t=1120&highlight=american+pionee r

You might have to join to read this post. I have read AP can be inconsistent.
I am using Pyrodex at the moment.A buddy of mine tells me Triple 7 is much cleaner. I'll probably give it a try when I run out.
Good luck.

Mike