Every rifle is very different when it comes to powder and bullets.When the knight mk-85 first came out I and a friend got one,his would shoot bigger bullets very good but would not shoot small bullets very good,Mine was the opposite it would shoot(180gr,185,200,240,and 250)well enough to make one large hole at 100 yds.
I have 4 different rifles and each one of them shoots something different,one shoots pellets,cleanshot,one shoots pyo,select grs..one shoots about eithr one satisfactory,one shoots clean shot powder best.