I just went to Gander Mountain's web site and looked around.
One item they sell is callled "Jim Shockey's Gold FFG Powder by American Pioneer™", which sort of implies Black Powder, but in the Q&A for this product someone asked if it was really black powder.
The response from Gander Mountain was
A:This is not real black powder. This is a substitute.
So purchase from them with care, and make sure you are getting what you think you are getting.
Rick