I guess it would be hard to compare a 451 to a 50. The 451 is a 1:20 twist. I planned on a 460 gr no excuse conical.For the Knight ,I planned on a 40 cal 260 gr Dead Center sabot. To make it more equal I guess I could use a 504. I have a Bowers Super 91 in 504. It shoots sabots very well. i could take the 504 1:24 twist and the 50 cal Knight with the 1:28 and shoot conicals and sabots out of both and see what happens.
Same bullets for both. maybe conicals at 50 yards and sabots at 100 yards. Just a thought