For some it's not a bad deal, you just have to remember that the powder is not an exact duplicate of the civilian canister grade they always assoc. it with. For example WC820 some will tell you it is close to AA#9 others will claim it is close to H110. Neither is correct, it's faster (way faster) than H110, yet slower than AA#9. About the same as Lil Gun or N110 in speed with the bulk of AA#9.
Needless to say you MUST work your loads up from scratch.