Just because it is an older model Knight rifle with excellent optics, I would suggest that you are in the ball park with the 110 grains of powder. I am not sure what the older Knights were rated at when they first came out. What is the barrel length on your rifle? If it is 22" then there is no reason to go any further then the 110 grains of powder because you would probably blow it out the barrel.

Also Knights like a tight fitting projectile. For that reason I would look at some Barnes Expanders in 250 grain or some of the Knight RED HOT sabot loads. Since you want to shoot 200 yards, you might need to try a number of different projectiles. Shoot them first at 100 yards and get a real tight group. Then get some big cardboard and see just how far they really drop at 200 yards. it might surprise you.

We were shooting 250 grain Shockwaves at 150 yards and it seemed like we were aiming almost eight inches over the white paper plate. You really need to get out to a range and work some loads in order to know what will work the best... Good luck.. 200 yards is a long way for any rifle actually.