Have him cut the mould .001" over throat diameter- regulated by whatever alloy you will be using the most. Then plan on sizing to .0005" under throat diameter. (I didn't cook that up. The benchrest gurus in the CBA worked that out generations ago- and it works.) Size/ream if necessary the case neck for a custom fit to the bullet and chamber neck dimensions. Follow those protocols and I will bet on you getting superb accuracy right out of the chute. Chamber/throat dimensions always drive bullet size. Always. Coupled with a good bore riding nose design adds to the chance for accuracy.
Why not have a couple weights in the same 4 cavity block? Versatility is nice. How about one of the cavities being a plain base design for low recoil/low cost/high fun/accurate plinking?
Last edited by gnoahhh; 11/06/14.
