I have a Ruger 77 ts in 7x57. It doesn't like 140gr bullets but does like 154's and heavier. Everything I ever shot with this rifle died, including a couple Bull Elk. I have thought about chambering to the AI version, but it's a somewhat rare rifle and it works perfectly the way it is. I have used the Bob Hagel data with 160's at 2800 mv in the past with no issues. Get a 7x57! Barlow