hey guys. I was wondering if anyone can give me some safe start loads for using .312 155gr. gas checked cast boolits. I have been shooting jacketed .311 SP for a long time and just started casting last week. By boolits come out .312 and weigh between 152-155gr. I am casting with a good hardball alloy and dont want to exceed 1600fps. I have alliant #2400, H4895, H4350, and HVarget. Thanks!