Wish someone would develop a .257 Magnum cartridge, and a J frame or 101 size revolver.
How 'bout the .256 Win Mag? That should work just fine. IIRC, it was based on the .357 case? Or am I thinking about another one of those obscure cartridges?
Not that I'm getting old, or anything..
EDIT: "The .256 Winchester Magnum was a firearms cartridge developed by Winchester, and was produced by necking-down a .357 Magnum cartridge to .257 diameter. It was designed for shooting small game and varmints."
Wikipedia comes through again!