Lead tin alloys age soften over time before stabilising.
http://www.lasc.us/Fryxell_Book_Chap...Metallurgy.htm
I've been casting some hollowpoint bullets, massive hollowpoints, with recylced air rifle pellet lead and they are too soft.
The nose section collapses as I put them through the lubrisizer.
I have some pure lead and some linotype and so think some experimentation is in order.
"An infinite number of monkeys banging away at type writers for an infinite period of time will eventually reproduce Hamlet" Thanks to discussion forums we now know this to be untrue.