I just ran across a very old book on handguns, with U S Army tests run on early Colt and S&W double action revolvers.
They put these revolvers through hell and malfunctions were few and far between even after using a solution to induce rapid rusting and no lubrication at all, then firing thousands of rounds without cleaning or simply scraping rust out of the chambers so they could chamber a round.
One thing I noticed was that even if the revolver was so badly rusted and fouled that it no longer worked normally, they were able to continue firing by turning the cylinder by hand while cocking the hammer.
I'll post a link to a free download of this and other works I found on the Internet Archive later on. Good reading to be found there.