I've shot both from my Knight, but only the PowerBelts at game.

Both are pretty accurate.

I took a medium-sized boar a couple of years ago with a 348gr Aerotipped PowerBelt over 115gr of CleanShot Powder (approx to 105gr of loose Pyro). It laid Porky out on the spot from about 15 to 20yds away. But the bullet passed straight thru both shoulders, with no apparent expansion as both entry and exit holes were the same size. It is possible that the bullet may have either broken up or bentover sideways...........but in either case, it was a clean hole straight thru.

Personally, I prefer a bullet that exhibits classic expansion..........it gives you better odds on a clean kill and a better chance of game recovery.