And I would like a holster made of unicorn hide.
The only PRODUCTION guns I am aware of for this round were the Wildey and the LAR Grizzly.
The LAR has been out of production since around 1999. Wildey was sporadic- unsure if they are even in business now. There were TC single shots made in this caliber. Anything you find will likely be one of those, or a custom production pistol.
Good luck- and keep an eye out for that holster, would ya?