Its a good looking rifle GRB. Your accuracy seems to be near the normal for these. I don't know what your requirements are for a deer rifle but for me that size group does fine and considering its a piece of deer hunting history you should take it out in the rut and get some deer blood on it. .DT
All 742/760s that I've fooled with did better with heavy RN bullets at moderate velocity. Both rifles are meat guns not target rifles. The nature of the design of barrel bolted to receiver adds to the swings in accuracy between individual rifles.
Never trust a man who rents pigs : Gus, Lonesome Dove