It's not about that stuff Sledge, I was envisioning an 'End of Civilisation' scenario where this might be a last, desperate resort for self defence and foraging, having run out of all other options.
Maybe I'd be better off just stocking up on a shootload more .22lr 
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Ahhh I C, you talking about end of days scenarios, funnily enough a good friend of mine and I ordered some tech grade potassium nitrate other month, our plan is to see how closelfy we can come to making commercial grade BP for precisely that reason. We need to make up a ball mill yet and give it a whirl (taking into account all safety protocols of course). We figure we can make primers etc we may as well give this powder thing a whirl to see how good we can get it.
Its good fun to use but dirty shit, get a stainless revolver if you plan on using it and find a good bullet lube, that will be your key to success. Lubricant is everything when dealing with BP.