All of my bullet casting so far has been pure clip on wheel weights. I have a couple hundred pounds of ingots from these. I will be casting bullets soon to load hotter than the 800-900fps .45 loads I have been shooting & casting .475 boolits that I have not cast before. FWIW the .32s I have cast from coww are shot up to max 1200fps and had no issues whatsoever.
Soooo...I think I need a slightly harder alloy for hotter .45s, .32s & possibly hot .475s. Filling the big molds out is a bigger consideration than hardness. So adding tin is the easiest way to go. Is that right? If so...where do I get pure tin and what form does it come in? If I am only going to be adding 2% or so it has to be in small pieces I am guessing.
So am I right and where do I get this stuff?