I need some 20/1 lead/tin alloy for the .45-70 low pressure Trapdoor loads I'm making.
Found a good load using Hogdon with decent 1645fps velocity, and a nice low 18,900 CUP, way under the 28,000 max recommended for a Trapdoor. 405gr hollow/skirt base that Lee makes for good bore obturation and rifling engraving for accuracy.
I got some Natchez shooters supply gift certs for Christmas, got all I needed, but to my chagrin, they don't seem to carry any casting alloy. To date, I've only been making Foster slugs for my cylinder bore Saiga 12ga, and they use pure lead, or hell... any lousy scrap I could find, dug out of my club's berms, and fluxed once or twice since they ride in a shot cup and never touch the bore, and I know they'll never be going through a choke anyway.
So when you can't scrap what you want, where do you go?