.257 Roberts in a pre 64 Model 70, Leupold VXIII 2.5-8X32MM, 80 grain Barnes Tipped TSX's at 3340 FPS.
Second, .264 Win Mag, also in a pre 64 Model 70, Leupold VX3, 2.5-8X32MM Boone and Crockett, 120 grain Barnes TSX at 3480 FPS.
Have use the Roberts since 1984 and the .264 since 1995. Both very reliable and comfortable to shoot and load for.