Use 7mm Weatherby loads, to start. 7mm will hit the pressure wall faster than the 308 cases will. Loading down can cause as many problems as loading hot. Hornady will make you dies. CD4H (sp?) might have something. They need 3 cases I beleive. Lonny will fix you up. That case holds alot of powder, reducing the recoil is gonna be hard. It will come a down little bit by using a 120 like the TSX. I beleive the was a 7mm-300 variant called an Ultra Cat. Could be wrong on that. I know nothing about the rifle. You need to post some pics
