I just purchased a new mould to produce 460-405 gr PB boolits. My question is ,for my Gc boolits my alloy I'm using is 3#ww+1# pb. I like that mix for my hunting boolits because it seems to give good expansion . Can I use this alloy for my PB boolits or do I need to mix something harder. I'm wide open to sugestions.I forgot to mention that I would like to stay in the 1500fps range or there abouts.