I just purchased a reproduction 1853 enfield. I have about 30 lbs of 20 parts lead to 1 part tin alloy which I use to make bullets for black powder cartridges. I know that pure lead is generally recommended for making minies, but can I get away with using the 20-1 alloy I already have? It would be nice if in the future I could use the same lead for cartridges and minie balls. Would it make sense to change to a 30-1 or 40-1 alloy next time I order a bunch of lead?