I would not go tighter than .440 in the back, and might go .0005 bigger. Shoulder diameters are pretty standard at .331 and I see no reason to vary that. The maximum case length on the drawing is 1.500 and that is shorter than "standard". Jack Neary's discussion on that point on one of his YouTube segments is worth watching if you have not. Using a freebore length of .070 seems a bit long, but depending on your bullet preference will be workable. It will rule out some bullets that you might want to try. I have .060, and if I were ordering a new one, I might try .035, and a spiral fluted throating reamer. The degree and a half leade angle is pretty standard. If you spend some time talking to Dave Kiff, there are some interesting options there, like dual angles, and other more exotic configurations. I have a very good one piece die that sizes necks to about .2575 and since I mostly shoot 133 and am cutting necks for more clearance these days, I might work with the die and go with a .263 neck, cut my brass for a loaded neck diameter of around .2605, giving something in the vicinity of .003 neck tension. The subject of freebore diameter gets interesting, we have a tendency to think tighter is better, but unlike throats that are designed for factory bullets, with no pressure rings, if we are shooting FB bullets, we need to decide what we are going to do about the .0004 to .0007 bulge at the heel. I think that the Scott reamer has this about right. If you look at older Boyer prints, they are smaller. I believe that thinking may have changed on this point.
