In my experience, recent Weatherby rifles are extremely accurate. My own .257 Weatherby Vanguard Sporter (made before the Sub-MOA came out) will put three shots into 1/2 MOA at any range out to 400 yards.
I also have two other recent Weatherbys, a Mark V Ultra Lightweight in .240 Wby. and a Mark V Sporter in .270 Weatherby. Both are almost as accurate the .257.