I had a MK85-54 knight and shot Cecils conicals out of it ... but that was 15 yrs ago .
I do not think he still makes the conicals but you can always find a mold for the T/C Maxi in .54 and cast your own. I found that the first gen Knights loved the maxi conicals and would shoot almost 1 hole groups at 50 yds and would open up a bit at 100