Had a Weatherby Ultra Lightweight in 300 WBY. Shot an amazing 3 shot group and thought I had found the perfect solution for a sheep rifle until it almost cost me a nice ram in the Brooks Range. Upon my return I found that the rifle would always throw one flyer in every group. Careful analysis revealed that the flyer was utterly random. Could be any shot in the group. Sent it to Weatherby and they returned it saying nothing wrong. Got a Weatherby employee in engineering interested. Returned rifle to him and he sent me a new rifle. Would not tell me why but I suspect a hairline crack in the receiver. Subsequently found that others experienced the same results in 300 WBY. My conclusion is that a 180 grain bullet at 3100 fps is too much of a good thing in a 5 1/2 pound rifle. Sold it new in box to my sheep guide and replaced it with a Win model 70 300 WSM in a 1 pound MPI stock. 100 fps slower and a 1/2 pound heavier but totally reliable.