Originally Posted by HardBall
The iron moulds hold heat better and, unless you've got the lead REAL hot and are casting fast, IME, an aluminum mold can be a bit fussy.
I like the Lee aluminum moulds but, a HardBall wrote, they do heat and cool quickly. If you like a slower pace, you might not like aluminum.
Why wheelweight alloy? It may be a bit hard for a front stuffer.