Whichever action you choose.......use a 26"> barrel.
A 1:9 twist will stabilize everything up to 142's. You don't need anything else even for elk or in Africa; kudu. Use the 140 Lapua Naturalis or A-Frame for big game.
I've found that RL-25 is good for every bullet weight up to 130..........anything heavier than that use VN N570 with a 215M primer. Or AA8700/H870.
The REAL advantage the 264 has over the 257 and 270Wby is no freebore.........mine have all been sub moa guns with very easy load development.
