Lyman has a formula for what they call "#2 aloy". I don't have it handy, but it's in one of their loading manuals.
It's based on wheel weights plus tin.
Makes good 122gr 9mm bullets.
I lube them with Master Lube from Brownels & load to 1170 mv with no leading problems.
They function flawlessly in my 92f & are as accurate as any jacketed bullet.
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Ralph in In.