Per Veral Smith: The purpose of annealing is to obtain the lowest possible hardness of a given lead alloy. Alloys which age harden when air cooled after casting will age harden again to approximately that same hardness within two weeks after annealing.

To anneal any lead alloy: Place in oven at 350 deg F for one hour, turn off oven and allow to cool slowly in oven. The lowest possible hardness will be obtained with a very slow cooling rate.

I will test annealed vs. age hardened