I have been shooting a STW for about 4 yrs now and absolutely love it!! Have killed everything from coyotes to Elk with it. The load that i have settled on is 71.5 gr IMR 4350, Mag primers, and 140 gr Accubonds at a COL of 3.595. The are going about 3300 fps down a 26" tube.
I have shot H1000, Reloader 25, and I believe I've tried maybe Win 760 when i first got it?
I can go back and look at the other loads if you need to know, but the imr works for me. I settled on the 140's, because speed kills! those accubonds are lethal!!!
I shoot 2 loads in my STW
Rem case/fed. 215/86 gr of H1000/140 nosler ballistic tip (max in my rifle, but be careful) this load runs 3550 fps from a 26" lilja (88 gr gives me 3600 but its a tad sticky)
Rem case/fed. 215/94 gr of WC872/160 nosler accubond (this is at 60 degrees F, y'all know about 872 so work this load up in cooler temps to get best velocity and cut back accordingly for hot temps) This load runs the accubond out at 3340 fps real good hunting load during cool weather.