If in doubt, use 20:1 lead/tin and go from there.
Lyman #2 is as hard as I would recommend. Its one of those "all around" good alloys for casting.
20 lbs linotype
25 lbs dead soft lead (cable insulation from around here)
5 lbs of 50:50 bar solder
50 lbs of the stuff last quite a long time, depending on how you shoot.
It also can be "hardened" by heating to about 425 F and then thrown into a 5 gal pail of ice cold water and then frozen in the freezer for a week. That will up the BHN another 5-7 points.
Last edited by Crazy Larry; 05/31/12 03:47 PM.