The .52 caliber Knight is an inline.. Nothing more then a fancy sabot that shoots a .45 caliber bullet. I personally see no need for one.

cayugad, Some body some where along the way told me they shot 50 cal. Pistol bullets out of it like I do my 54 System One; is this not true? Lee

t/c thunderhawk or firehawk come in 54 cal.
I think the t/c sysytem 1 also had a 58 cal.
the above guns are older models and they do come up on auctions blocks at a great price
I have to say if looking for a round ball shooter then the above cal. like 54 and 58 are a o.k.
I think as far as using sabot bullet aor conicals a 50 cal. will run nec in neck to a 54 or 58
I have a 50 cal. thunderhawk and using a 375 or 425 grain buffalo SSb Boatail bullet it will stand up to any 54 cal or 58