Re: 338 edge 30 or 40 deg.?
This is only my opinion, but the 30 deg shoulder would be my choice. The 2 most accurate cartridges I know of, 6mm PPC and 6mmBR, both use 30 deg shoulder angles. Whether or not a 40 deg shoulder is as good or better is beyond me, but for proven performance, I know that 30 degrees is good. Seems like it would be better for ease of feeding too.
Good luck, Tom
Texas State Rifle Association Life Member
NRA Endowment Life Member
A big fast bullet will beat a little fast bullet every time