Just to add to what Ribben says. There is not a one size fits all for bullet casting. Different velocitys, pressures etc dictate different approches.
The .45acp and 38 I use air cooled wheelwheights (ww), for rife, as ribben said, the 45-70 some even use plain lead, some use lead-tin, I use ww. For the 30-06 I use linotype for gas capped, and plain base water quenched for slower velocitys with pistol powder. Pick up the Lyman Cast Bullet Handbook, and go here Cast bullet forum
this forum covers all the aspects of bullet casting, sectioned off for casting equipment, group buys for molds, and general casting problem.