Firstly, I hope this is in the right section. Secondly, I have been searching on this and other forums, but I would like to get this right, which is why I am asking here.
I have an Accurate Mould for a 405 grain bullet with huge metplat. Two chambers, one for a gas check bullet, one without. The lead I am using is pretty much obliged to be plain lead. I'm casting and then dropping the bullets into cold water. The bullets are to be used for informal target use with nitro powders but may be used later for deer if I can comfortably meet our legal requirements here. They are primarily for use with a Marlin 1895 with microgroove rifling in a 22" barrel that slugs out to .460". I have managed to open up a Lee sizing die to produce .461" (more by luck than judgement). The bullets will be (are) Aloxed.
My question is, what maximum velocity should I aim for to avoid leading the barrel, but to get the best accuracy and muzzle energy? Powder recommendations are not particularly useful as I am limited in the choice of powders that are popular in the USA. I can get a good estimate on velocity by using Quickload and verify with a chronograph.
TIA.