My favorite load is 79.0 grains of RL 25 behind 160 grain TSX @ a chronied 3370. Recoil is nothing to worry about, especially given that you're generating about 3800 foot-pounds of energy at the muzzle, and accuracy is incredible. Zero'ed at 300 it drops just 7.5" at 400 yards.
Either you have a 36" bbl... or are running well into the red on that one... only 150fps faster than the 7 RUM
Nope - that is totally doable with 24 - 26 inches. The 7 STW in my opinion, and in my experience, is under rated in every manual that I have seen. I (and a couple buds) were consistantly getting 160's over 3300 and 140's (my favorite load for the STW) at about 3500 - both loads at safe pressure levels. My 140 load zero'd at 300 was only 18ish inches low at 500! I loved that rifle! The only down fall is that with all that powder you don't get very many shots before signifigant throat errosion.
7 STW, I used Nosler bullets, H1000 powder, Remingtom 8mm mag brass (necked down of course), and Fed 215 primers. Work up a to max and then back off a grain or so - seems to be where this caliber shoots best.