Good stuff. Experience is what counts here, rather than theory, that's for sure.
The Ramshot load data shows a max charge of Magnum giving velocities close to 3100fps for the 7WSM with 160/162gr bullets. This is in line with my own experience and load data. I use a load of IMR7828ssc that is 0.5gr over the max load listed on the IMR website, but I see an average of 3081fps from my rifle. My experience with the 7RM has been nearly identical (which it should be, since the case capacity of the two cartridges is almost exactly the same), except that if you push it really hard I've seen 3100-3150fps at the top end with a 160gr bullet. I'm perfectly happy to run the WSM or RM at 3050-3100fps with a 160.
I know the MSM could get me an extra 100fps, but I just don't think that would affect my hunting or shooting even one iota. Like I said before, I certainly wouldn't mind building a Mash, but it would be for conversation's sake and the "cool factor", not for the "performance gain".
It's blowing snow sideways here right now. How are things going down that way?
