SHills,

Haven't tried the SST's or the Powerbelts, though the Sabertooth is basically an inexpensive Powerbelt. Today's test bullets were:

Speer GD 300 gr .452
Speer 300 gr .451
Hornady 250gr .452
Hornady .458 (45-70) ?gr
Knight 310 gr .452

and a variety of sabots