hello, and thanks in advance for the help. I am looking to start casting for my freedom arms 454 casull/45 colt conversion and have already posted in one of the group buys for a mould. heres my question: since the loads, for a 350/325 gr boolit, for either gun will be under 1550 fps, do I need gas checks or not? I don't plan to ever get an snw 460, so the casull would be the hottest loads I will ever shoot with them. I posted I wanted a 5 cavity mold with two PB and two GC with one hp GC, but do I really need the GC's? what would you guys do? jim