My father has an WBY Uktralight in 300 WBY. The only bullet it will shoot is a Barnes TSX 130 grain loaded hot. It will shoot those just under an inch at 100 yards. Anything else is all over the paper. The pencil thin barrel needs to be bedded to dampen the vibration. I have a ultralight in...
My 7mm ultra in a Sendero will shoot 1 inch to 1 1/2 inch groups @ 500 yards off of shooting bags. I have also shot a few 3/4 inch groups at that range with it. The only work i've done to it is a trigger job. I also have a stock 300 ultra mag in a 700 PSS that will do 2 inch groups @ 500...