Get some H1000 and some Berger 180s. Load to kiss the lands, and work up to Hodgdon's max load. My guess is that you'll end up around 68.5 to 69.0 grains.
My current whitetail loads for my A-Bolt II 7Mag is: 160gr Nosler Accubonds, backed by 60.0gr of RL-19, and a Fed 215 primer. I will soon be doing a little more load development on it, just to see if I can possibly squeeze any little bit more accuracy out of it. But so far, it's a pretty consistant and close-grouping load for my rifle.