The deal with SSTs/Shockwavers is the same deal with almost any similar composition bullet..... performance derived on shot location &powder energy/bullet speed. One poster aims for bone while hunting- the other for soft tissue. One poster uses 120 grains - the other 80 grains. One poster unknowingly deforms the bullet head while seating it -- another one doesn't. Etc... Etc... Etc.

There are performance variances-galore with muzzleloaders. These are not centerfires or shotguns with factory loads.