I don't own a Knight KRB7 but wish I did. Like any Knight ... two pellets and a 250-300 grain Knight RED Hot sabot combination should produce good results. Knight RED Hots are Barnes Expanders.

My Knights also shoot Shockwaves very well. You might want to try some of them. Depending on what kind of bullets you cast, even they might work.

My Knights also shoot Saber Tooth conicals well, and Powerbelts pretty good.

All you can do is try some of them, but a bullet 250-300 grain should produce good results. All you can do is try some of them. Good luck with your new rifle.