1911Tuner
Moderator Emeritus
Better yet, make up some 16:1 and test it against pure lead.
+1Tin does nothing for boolit hardness, a little tin gives better mould fill out for casting.
For what it's worth, I've never found any real advantage or need to go higher than about 11.5-12 bhn for pistol bullets, and have shot it at top-end magnum revolver velocities without problems.
The problem with using antimony to mix with pure lead is that a standard electric casting furnace won't get hot enough. The melting point of antimony at sea level is 1167.13 °F. Call it 1167 even.
Lino and Mono melt at 446 degrees F and cast at 572 degrees F. I use mono and lino in casting and never go over 750 degrees.
If it doesn't melt, it doesn't mix.