ORIGINAL: corey012778
I have read about the towel in the bottem of an bucket water. I air cool. I placing an towel to keep the bullets from denting.
IF you air cool, they will never get any harder than the unheat-treated alloy is. Wheelweights are about 8 or 9 Brinell air cooled. Good for low-powered plinking loads, BUTway too soft for 2200 FPS from a .30/30.