I have no idea what my alloy is. I get all the .22 cal. splash I want from a friend who runs a college shooting class where almost all the shooting is done with .22 LR. The backstop is steel, and the splatter falls into traps at the bottom. I suppose it may have some tin in it, but it is very soft and close to pure lead, as far as I can tell. Regardless, I cast everything with this stuff, and I've never had trouble with fill-out in the mold or leading. Personally, I think too much is made of exact alloy ratios. I've found that as long as I get good fill-out, and the bullets are clean and well-formed, there's either enough tin in the melt to accomplish that, or my casting temperature is adequate. Either way, my personal experience is that soft is good, and I've yet to get leading with any blackpowder round I've ever loaded. I can see where alloy percentages might be more pertinent in hunting applications, or when casting for higher pressure smokeless; terminal performance needs to be predictable in these applications. But I really think that we make a bigger deal out of alloy ratios than we need to when we're casting for just target shooting, competition, or plinking.