5 out of 6 guys I know (myself included) are shooting the T/C Shockwaves 250gr and Triple 7 with great results. All 5 are shooting T/C guns though, the 6th is a Knight guy, I think he sticks with Barnes bullets.
The one guy I actually shoot with can repeatedly get 1" groups at 100 yards with 100gr of T7. My Encore seems to like more powder and prints 1.5" with 125 grains of loose T7 (cant seem to get that magical 1" group). We played with the chronograph last time and noticed that his Omega consistantly averaged about 75-100 fps faster than mine with identical loads and charges. Slightly tighter bore?
FWIW, going from 100 gr's to 125 gr's of loose T7 added about 350 fps at the muzzle (1700 to 2050 fps) and printed about 10"-12" higher at 100 yards. We were a little surprised by that big of a change. Dead on at 100yds printed 3.5" low at 150 yds, grouped ~2.5". Bumping up to 135 gr's added another 80+/- fps, group size was the same but I decided to stick with 125.
Probably more info than you were looking for there but I tend to ramble...