WELCOME to the sport and the forum. Well you picked a good rifle, thats the same Knight I have been shooting,but those power belts were not designed for that heavy a load 70 or 80 gr if you feel you want a flatter trajectory check out the Sabortooth by Harvestor, there are a number of good bullets by No Excuses or Bull Shops and I personally like the Maxie ball the 370 to 405 gr bullets shoot especally well in my Big Horn. If you were to tell what state you will be hunting in it would help us determine what to suggest that would be legal. Lee
PS: I find the musket cap produces the best results in mine and do take the advice on switching to loose powder pellets are a waste of money and dont allow you to adjust yor load to what shoots the best.