cur...T/Cs have a smaller bore than Knights...I would bet your Disk Elite will be easier to load than the Encore....I would recommend not using pellets for two reasons...Loose powder is cheaper and you can fine tune your load easier by measuring your charges...remember with a muzzleloader you are hand loading each shot....I can usually achieve better accuracy with loose powder than pellets....If you want to still use pellets than yes, you can use a mix of 50gr and 30s...I would start with 2-50gr pellets...Or 100 grs...If you use loose...I either use real bp (Goex) or Pyrodex R-S...I do have a buddy that uses Triple 7 in his Knight....
I have a Knight Disc....I use 90grs of Pyrodex or Goex....and 250gr T/C Shockwaves....my rifle prefers T/Cs over the Hornady SSTs....Actually it preferes last years T/Cs...because the sabots were shorter than what came with SSTs.
I like the SST design bullets (btw...Hornady makes SST and the T/ C Shockwaves...same bullets)....The reason I use the SST design, is because of the aerodynamics of the bullet...I sight in 2 1/2 inches high at 100 yards...and I'm about 2 inches low at 150...I hunt both in the woods and fields...so I could have a 150 yard shot...If you hunt mainly in the woods....With closer shots you might want to try the .451 Hornady 300 gr XTP...they can be bought in bulk at a local gun shop....and you can order .451 sabots from MMP....If they load too hard or don't group well, try the .429 Hornada 300 grain bullets with the .429 green MMP sabots....Its trial and error what your rifle prefers...I would start with a 100 gr load (or 2-50 gr pellets) and go up and down by 5 grs until you find what your rifle prefers....If you try the Triple 7 loose powder...don't go over 120 grains...
Most of the rifles I have sighted in prefer 80-120 grains...and thats plenty for whitetails....
I clean my barrel between shots....remember you are handloading, so you want the barrel to be conditioned the same, so it will group well...I use rubbing alcohol, put in a sprey bottle...dampen 3 cleaning patches and wring out excess....you don't want them dripping wet because alcohol will seep into the breech plug and cause a missfire...Run three alcohol patches down the bore (both sides) then a dry patch, then a lightly oiled patch and then another dry patch and you are raady to load again....Once you get a good group at 100 yards I would sight in 2 to 2 1/2 high at 100...and see how low you are at 150...Good Luck