Well I had a knight disc extreme last year that I had to sell to pay bills, really wish I didn't get rid of it, but I had to. So today I set out to try and find one. After cruising all over, Cabela's, skagit arms, various ranges I finally would up at Kesselring's. I walked out with a very lightly used knight mk85 in 54 cal. My knight I owned last year was a .50. is there much of a difference in loads from 50-54? Other than that I'm stoked to get to be out in the woods with a muzzleloader again!