64 caliber Colt revolving rifle

Hello Gentlemen
Would anybody have some information concerning a limited production 64 caliber Colt revolving rifle made sometime between 1850 and 1870? It may have been made for naval use. I am looking for information about the cartridge configuration, paper, foil or metallic casing. I have heard there is a gentleman in Ohio that has a specialized Colt revolving rifle collection that has a specimen of the rifle with the mold. I would appreciate any information ya'll could provide. Thanks. Sharps