RE: good starting powder for 7mm Mag
I've tried a number of different powders loading for my 7 mm mag. I've settled on IMR 4350. I shoot out of a Savage 110 and the gun seems to like the loads with this powder. I'd strongly agree that experimentation is the key for all guns are as individual as their owners. Good luck and be safe with your reloading adventure trying to find that perfect load for your gun.