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Here's a Freedom Arms Model 83, this one is chambered for .500 Wyoming Express, a cartridge of Freedom Arms' own design, being one of many high powered .50 caliber revolver cartridges. It's actually a 'belted' cartridge case as well, meaning there's a pronounced ridge above the extractor groove, for more secure headspacing, or rather, that was the original concept of a belted cartridge case, I feel that Freedom Arms just designed their case that way to make it look really cool and different.
A 'light' load of .500 Wyoming Express can be a 370gr projectile going at 1300fps, which is quite spicy as is, and for a heavier load, a 440gr projectile going at 1200fps.
Something Freedom Arms offers as an extra with revolvers in .500 Wyoming Express, is a separate cylinder chambered for .50 Action Express, the rebated rim cartridge most famous for the Desert Eagle (Magnum Research will also offer their own quite fine BFR revolvers in .50 Action Express on order). .50 Action Express is roughly about as powerful as .500 Wyoming Express, with a 330gr projectile doing 1500fps, a decent bit lighter projectile, a decent bit faster, but all in all both .50AE and .500WE have quite comparable footpounds (thus why I figure the belt on the latter's case is just added for coolpoints, as the former seems to headspace perfectly on the mouth of the case and with no rim at all).
If you already had something like a Desert Eagle pistol, and a bunch of .50AE ammunition and reloading supplies, I figure this extra cylinder would be quite an attractive option.