I am very pleased with the accuracy of my Max on the sb1 frame. I had a little trouble with headspacing, (misfires) don't know if I goofed when I reamed it and cut the rim to deep or if it came from the factory that way. Quick and Larry provided the cure.........machined the extractor down a little and put a small spring under it to hold the brass against the breech and all is well.
I have gotten fairly close to max loads with no problems developing, so for me it was the thing to do. It just seemed like to me if the sb1 could handle the pressures of the 30/30 it would do ok with the maxi. Just my opinion.
Bobby