Am I crazy, or would a .223 revolver be awesome???

[Whip_McCord]

Not exactly what you're looking for, but Magnum Research has the BFR: Big F@$%&^ Revolver. Here is the 30-30. There are other calibers.

Magnum Research .30/30 Win Revolver, 10-inch Barrel - Style # BFR30/30, MRI Shop / Firearms

There is always the T/C Contender in .223, if you want it in a pistol. I have the 14" barrel.

 

[45fan]

Charter Arms is making a .380 revolver, extraction shouldnt be much more than that to engineer. Flame cutting at the cylinder gap could be an issue, but a sacrificial stainless steel sheet metal clip over that gap should keep that issue at bay. I think Smith and Wesson does something similar in lightweight framed magnum revolvers.

Fitting it into that big of a gun shouldnt be an issue, but unless you are putting a 16" or longer barrel on that thing, the fire balls will be enormous. Any way you look at it, that blast at the cylinder gap will be vicious.