I've cast a whole lot of them... you need to keep your lead hot... that is a lot of lead to pour... I use a ladle with a large pot with about 60 lbs..runs good once you get up to temp... I used pure lead, but have heard of improved accuracy from a guy who uses straight wheel weights... I cast up a few to test... they look great, but haven't shot them yet for testing... by the way... on my pure lead ones I also fill the base with hotmelt and knurl the edge of the slug for improved accuracy... You can find a lot of info on Shotgun World site under Slug Shooters
TheMoose