mean YOU can. Sure,Dupont made proper black powder. doesn't mean YOU can get away with it. Even Dupont blew up some powder plants, and THEY knew what they were doing. You don't. They had months and months in which to prepare,you wont. The entire idea is just STUPID,man. Where you gonna GET the sulphur and nitrate? have to roam all OVER the Rockies to do so. Aint worth it. Just CACHE a few thousand rounds of .22lr,in different spots, a few hundred rds of 223, and you will be good for 50 yrs. What makes you "think" you will have months to dick around with making black powder,finding the ingredients,etc, yet you CAN'T get backto ANY cache,hmm?