Powerbelts don't do too well out of mine either - others have had better success. Mine loves the T/C shockwaves in 250 and 300 grain with 90g T7. Out of a clean barrel, I can get 2.5" at 100 yds. I use the powerbelts in 295g for a second shot due to the ease of loading -- but the impact point is 4"left and 2" low at 50 yds compared to the shockwaves. The hornandy sst are the same bullet, but with a different sabot - try them with 2 pellets of either T7 or Pyrodex. Good luck!