The SST and the T/C Shockwaves are the same when it comes down to muzzleloader sabots, Hornady makes them for T/C who then places a new name on them, and sells them under there name.

As far as the SST shotgun slugs, I use them in my H&R 20ga., excellent results. I shot a buck last year here in NJ, about 80 yards, the only shot I had is where the neck meets the body, one shot and he dropped in his tracks, so I would say they are just fine, and like others have stated shot placement is key