I like my wadcutters to be around BHN 8-9.
To get there with clip-on WWs, it's a 3:1 mix (3 lbs lead for 1 lb clip-on ingots).
If fill-out isn't quite good enough, add 1 ounce of tin per 4 lbs of alloy. (Takes you to just under 3% tin, with 95/5 solder; or just over 3% with pure tin.)
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Don't even try it. It's even worse than the internet would lead you to believe.
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