SHB
This is something I enjoy doing and will do for you as a
BLACK POWDER ONLY pistol.......
Raven has said before that for liability reasons they are constrained from offering these larger caliber conversions.
The one pictured above has the forcing cone cut back to the length of a Walker cylinder (by the way it is a 1st model and the oval notches are a non issue). I then also fit a Walker cap and ball cylinder to the revolver as a "switch" like you are wanting.
The Walker cylinder, after I ream the chambers, will accept a case the length of a 460 S&W (
but not factory loaded 460 ammo) and 60 gr of 3fffg Swiss if dropped well. The Dragoon length shoud take the 454 case and maybe 5 or so grains less powder.
Doing this is with the above understandings and we need to mark the pistol for the caliber designation. Somthing like 45 - 1 & 3/4"
This has the same owner/shooter resposibilities as knowing not to load smokeless in your cap and ball revolver
HH