i have a knight mk85 and shoot 250 grain red hot bullets with 2 50 grain pellets.i would like to jump up to 4 30 grain pellets and a 300 grain red hot bullet.i'm shooting a shotgun primer now. any comments that you have on this change would be appreciated

I used to have mk85 but never shoot over 100 grs of powder,I would shoot about any grain bullet I put in it pretty good,I shot bullets from 180 grs to 250grs,It shot so good that I never saw the need to try more powder.I do think that most ML gives the max load as 120 grs,and some say 120grs powder or 150 gr pellets.Hope this helps
I wish I still had my m-85

My BK 92 is a MK85 with a cheap synthetic stock. 2 50 gr pellets and a 300 gr saboted bullet work great and I cannot imagine why you would want to increase recoil and expense except maybe if you were hunting dangerous game or shooting over 125 yards. You are 100% correct in going to the 300 gr bullet for hunting as it gives much more energy downrange. May I suggest the Barnes 300 gr Expander? It is awesome on deer. After checking out all the new muzzleloaders I bought a Knight Bighorn, 50, 22"barrel and have outfitted it with a Williams apeture sight with the shotgun apeture mounted where the original rear sight was ( this is for 50 yards and under hunting with adequate light ) and a Leupold 3x9 mounted on Leupold Quick Release Rings for longer range hunting like out of a blind and in very poor light conditions. Enjoy your MK as it is a very good gun. I use the secondary screw down safety often and Knight is the only company that has this great feature.