The muzzleloadingforum won't even address the making of BP. One of the forum's rules says it is a no-no to discuss it.

At federal level you need a explosives mfgr's license. State and local chances the same. The local fire dept would have a field day with someone making their own BP.

Lastly if one wants to know the process get Phil Sharpe's book "Complete Guide to Handloading"