i have never yet been to Africa , but i know plenty about a 257 Weatherby mag. mine are 1-10- twist that i have used , my reloads with a 100 gr. bullets shoot 3700-3800 fps. i like 2 brands of bullets the best 100gr. Nosler Partitions and 100 gr. Swift A-Frames both shoot excellent on animals . i have never got Barnes bullets to shoot as consistent on paper in my custom barrels as Nosler or Swift shoot . i also have just built a new 257 Weatherby mag. with a 1 - 7 1/2 twist that i have not started shooting yet with bigger gr. bullets in the 130 gr. class. good luck ,Pete53
Wow. Mine will show pressure and a hard bolt lift with that velocity. Would you mind sharing what powder you are using. I am using IMR 7828 and H1000. 3600 is all it will let me do.
