wild bill's setup were acurrately 36 caliber 1851 new navy colt cap and balls. he owned many guns through his life, at one time evan sporting a schofield. uberti makes an excellant true replica and cimmarron weapons carries them and or can order the gun for you to specs. p.s. a 36 would bore to a 38 but no further because of lack of metal in the barrel.
The .36 cal cap & ball bore is alread bigger than the bore for a .38 cartridge. With a conversion cylinder to .38 cartridge ya need to use a hollow base bullet to expand into the rifling.
( Back in cap&ball days the .36 was the bore before the rifling was cut. Now the "bore" is the dia of the grooves in the rifling. Some have the bore of a c & b .36 relined to make it an actual .38 cartridge bore to aleviate the need for the hollow base bullets. )
Man you could have fooled me! I'd like to have been there to see the look on their faces when that cannon went off. Looked like the guy firing it was a little apprehensive for as long as it took him to squeeze the trigger.
No, it comes with a gun carrage and a horse to pull it. Seriously, if you are going to carry 2 Colt Navy replicas you will need good holsters and a strong belt. Those guns are heavy. Get a pair of right and left "crossdraw" holsters. These will give you the foward tilt. Then you can wear the sash to hide the holsters.
Hickok packed '36 Navies. His were bright-plated, most likely nickel, & had ivory grips. Dixie Gun Works, Gunpowder Lane, Union City, Tennessee--send 'em $6 & your name & address & they'll send you a catalog about as thick as the old Sears fall-and-winter that's flat loaded with just about anything you could possibly want, including stainless Navies & sashes like the one Hickok tucked his shooters in. They can most likely find you a source for a conversion cylinder for .38 spl blanks, & probably a conversion hammer as well. .38 blanks are available commercially & are reloadable. 15 grains of FFFFg & a tight toilet paper wad will make all the noise you can possibly need & is actually safer than most commercial blanks. The toilet paper comes out as confetti, though the flash is dangerous to about 5 feet.