If the accuracy of them is there, they would be fine. Although I would guess they might start to keyhole at long distances, but should be fine out to 100 yards. All you can do is try them but at their cost, you do not really want to shoot to many. They were made to be shot out of the faster twist barrels, but many people underestimate the 1:48 twist. It will do a lot more then people think.

Whether it would have better performace then a conical bullet in a hunting situation.. well that is hard to say. I have shot conicals deer hunting and they always worked excellent. Also do not forget the effective abilities of the roundball. All too often people look for a bigger better projectile when the one they have works fine. Shot placement will always be the key to any projectile you shoot.

All you can do is shoot some powerball and see whether the rifle likes them or not. Do not try to push them too hard, and remove the plastic button off the bottom of them first and lube the lead conical spike. Then replace the button and shoot. It will help the powerbelt shed the button faster.

Good luck with what ever you try.