I've shot both the 250 gr. Shockwaves and 250 gr SST's. The shockwaves wouldn't shoot in my Knight Extreme, but would shoot well in my Omega. The SST's are way to hard to load in my Omega, but shoot extremely well in my Extreme. The bullets themselves are the same, but the sabots are different. There's actually a weight difference in the sabots. The SST sabots being heavier.