I just bought a box of old black powder stuff and included in the lot was an ancient can of Dupont No. 1 smokeless rifle powder. The can looks like it was from around the turn of the last century and is still almost full! It's also in very good condition. Interestingly, the powder appears to be sort of an off-white color. I burned a pinch of it on a scrap board with my lighter and it seems to burn smoothly and somewhat slowly, just like modern smokeless rifle powder would.
While I don't intend on using it, it seems that you could. What I was really wondering was if the old tin - and possibly even the powder - had any collector value.
Best regards
Doc