I have an opportunity to pick up one of the few remaining sako 75s in either 7mmstw or 7mm ultramag (Sako is no longer offering these calibers). Practically speaking, when both are loaded to maximum pressures, what velocity difference can be expected shooting 150-160 grain bullets. My sense is the stw might give up 50 to 100 fps but at the cost of signicantly more recoil and reduced barrel life. My plans for the rifle are as a long range deer/back up elk rifle (it will share space with a 300 win, 300 wby and 340 wby). I will be shooting only premium bullets. Which should I choose? Forunately, need has nothing to do with the analysis!