I would like to posit that the pictured firearm is a Taurus Raging Judge Magnum... capable of shooting a 3” magnum .410 shotgun round, a .45 acp round, and the star of the show- the .454 Casull round. Ballistics of the .454 Casull, will give the shooter a chance to fire a 300 grain bullet down range at approximately 1800 feet a second. It’s credited with dropping the top five big game animals of Africa. I bought the snub nose (2 1/2” barrel) only to learn that it is illegal in California, where I planned to carry it on a hike.
Back 1968 or 1969, a gun magazine had an article about a gunsmith who took two 1917 Colt 45ACP pistols, cut the cylinders and silver soldered them together so they were longer.
Then he cut the frames, welded them together longer, and made a .410 Colt 1917. Back then, he still had to register it with the BATF.