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I notice that you're looking at .45 ball and I'm curious why you think they need to be hard? If you're shooting them through a .45 ACP, they're going slow enough that pure lead would suffice, with just enough tin to get good mold fill-out.
Folks shoot a lot of Hornady and Speer swaged ball and I doubt you'll find any softer lead than that. I cast bullets for .45 ACP from whatever scrap is laying around and save my hard alloy for calibers with more speed.
But, yeah, to answer your questions, the percentages are by weight.
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