Since you have a Knight, be careful and check if you use Powerbelts. Some of them will slip off the charge. Check it from time to time if this is your choice.

Another option since sabots are not allowed are .460 grain No Excuses Conicals. I think you will find them very accurate out of your Knight rifle and with the weight of them will get excellent penetration. I shoot them out of my Wolverine with 85 grains of Goex 3f and the accuracy is outstanding.

I have read posts by other Knight owners and they found them accurate also.... Just a thought for you. Put that big conical in the rifle place and it will do the rest.