Freedom Arms Model 83 .500 WE

Model 83 .500 WE is a single action revolver manufactured by Freedom Arms chambered for the .500 Wyoming Express round. In the 1986 film "Armed and Dangerous", John Candy brandishes a Freedom Arms Model 83 chambered in .454 Casull (with sniper scope), claiming it's "a .50 caliber," designed for "hunting buffalo...up close." Candy adds that the firearm is only legal in four states, and "this [California] ain't one of them."
Nate Romanowski - a continuing character in the C. J. Box series of “Joe Pickett” books - falconer and former special forces - carries a .454 Casull which he shoots with uncanny accuracy and without an electronic sight.