I was able to range test again today, using the 139gr Interbonds. The 7mmRemMag will be only my backup rifle, but I wanted the accuracy to be there, in case I do need it. The load came down to either 70gr of MagPro or 70gr of IMR7828. The accuracy was about the same. Both loads, using Fed215 primers would print five shot groups, just a tad over 1" at 100 yards. The load using 7828 chronied an average of 3240fps, while the MagPro load was 100 fps slower. I am going with the 7828 load, mainly because that propellent fills the case, whereas the MagPro has lots of space in the case. I believe that a full case of propellent will give more consistant groups.
Earlier this week, I had tested with more propellent. I did not get signs of too high pressures, but the groups were 2" or more at 100 yards.