How many combinations of hand-gun / long-gun in identical caliber can you name? You may NOT say .410 shotty and Judge 3-in Magnum! Otherwise, be creative. SMAR.
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That would be a very long list since you can get almost any caliber in a Contender pistol,including a lot of wildcat rifle calibers.
The largest rifle caliber that I've seen in a production revolver is a 45/70 Government.Magnum Research maker of the world's most powerful handguns