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Those rounds are .41 Short Rimfire, which was used mainly in "derringers", Remington's and others*. There was also a .41 Long Rimfire, case length .630" or thereabouts, which was used in revolvers, Colt's and others. Like other calibers, the "short" round could be fired in a gun made for the "long" but the opposite was not always the case.
*Not by Deringer; he died in 1868 and the only cartridge handguns produced by the company were revolvers.
Jim
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