My first ever cap gun was a Pietta, the '51 Navy 44, 1972 gun show buy. Used .451's in that, later after buying Uberti Dragoon/1860 Army went to the .454 ball. After getting another Pietta 51 44 caliber I just continued to use the .454's with no problem.
Didn't want to cast separate 451's and be carrying 44 caliber cap guns out shooting both using a slightly different size 44 ball, enough to carry esp on a shoot, while walking/plinking. The original '51 Navy 44 met an untimely demise accidently getting mixed with items destined for a burn pile-call that one my Josey Wales gun. Still have it, don't shoot it, although I've been going to reconstruct it, have parts, just needa do it.
If getting one, I would cast/try .451's ifin the .454's are hard to load with the shorter load lever. Looked at those Slix adapters, they don't give those away. Think something like that could be fabricated without too much problem. At the distance's I shoot cappers, most of the time which involves alot of point shooting and such, that .003" with the .454's would be of no consequence, not going for cloverleafs, more like minute of tin can, minute of water filled milk jug, and back in the old days of river walking, minute of carp.
Ah those were the days, rough fish extermination on the banks of the two rivers in my area, carp only, no game fish. Days of combination of carrying both cartridge and percussion revolvers at times, sometimes up to three hoglegs at a time. Strong side, weak side, shoulder holster, plus shootin bag weighing enough to sink a boat.. Fast shooting, developed pretty good form, was a big plus when I got into law enforcement qualification shooting and various PPC and CRC competition shoots. We used too also roll pop/beer cans down sand/gravel piles shooting at them coming down, get as many fast hits as possible. Sometimes you'd blow em back up so as more shots could be taken before cylinder was empty. That shooting is where one of those Hollywood 20 some shot revolvers would have been nice, carp shootin to just thinking about it. Did use my 22 semiauto's at times but those 10 round capacity magazines would go dry. A Marlin 39M 22 worked good, what are they 15 rds?
OK, I'm rambling, hijacked my own thread. Good day to all. Thank ya kindly again Mike fer yer expertise. Crow Shootin Choker of Twin Rivers River Bankin Posse!!!!