I didn't read the whole thread but of the cartridges you own the 338 RUM or 375 RUM if they are setup properly. 300 Bergers from the 338. There is some of us shooting 390 gr A-tips out of 375 RUMS at very impressive velocities but you need a long barrel with the proper freebore and twist rate.
If you are looking at something you don't have Robert Vestal from Vestal Custom Rifles has come up with some BIG BOOMERS. 416,458 and 50 Vestal.
375 Cheytac is basically the Easy button for starters at ELR
If you are looking at something you don't have Robert Vestal from Vestal Custom Rifles has come up with some BIG BOOMERS. 416,458 and 50 Vestal.
375 Cheytac is basically the Easy button for starters at ELR