I have a Ruger M77MKII Stainless in 338. Bell&Carlson stock, Timney trigger and a 2.5x10x44mm Sightron. I have been shooting Federal Fusion 225gr it seems to like them. I have 3 old models like yours, this one, a 77/17HMR, and bought the wife a new M77 Hawkeye last fall. You can't go wrong with the Rugers other than the occasional sucky trigger but throw in a Timney and good to go.