Whenever I re-barrel my 270 WSM I will go with a 1 in 7 or 1-8 because of more new longer bullets. Not sure if the Weatherbys speed will make up for a slower twist or not with the 170s and other VLDs. Hill Country Rifles thought the 1-8 was on the fast side for the 6.5x300 Weatherby and build theirs with 1 in 9 twists. At least for them it has proved more accurate. The only light weights I will shoot are the mono metals so the higher RPM could increase the leathality or so some believe.
Which barrel makers twist 270 cal faster than 1-9? Most are 1-10 only.
Benchmark does a 1 in 8.5. My 1 in 9 barrel is a Benchmark, at the time I bought it they didn't offer the faster twist. I would buy that 8.5 in a heart beat if a new barrel is needed. I believe Pac Nor offers a 1 in 8.
