Don't take it wrong but if I was building a 257 weatherby, it would have a 7mm Rock 8.5 twist in a #3 contour and have a 7mm remington chamber with a bit longer than normal throat. Been the Roy route, fun, but for longer range stuff the bigger pills served me way better.
I have a gun similar to that setup. Its a Model 70 with a #4 Brux chambered in 7mm STW. Is was throated for the 168 grain bergers. It shoots well, I want something a little lighter.
