Very interesting video and very good shooting!
I was especially impressed with how well you fired and cocked with your left hand, since you had never done it before. :thumbsup:
On a speed load for your revolver.....
Though in the UnCivil War, U.S. Navy Uniform Regulations (and to my knowledge the only place it is mentioned in any Uniform Regulations) talks about a cartridge box to be worn on the belt to carry 1 or 2 spare cylinders; it was never an issue item to Sailors or Marines for landing parties or any other duty. There is no other reference to them in Uniform Regulations I have ever heard of. I don't believe any such "Government Issue" cartridge boxes for spare cylinders were ever made.
It has been reported that in Session of Congress: 40th-2nd H.exdoc. Serial Set Volume: 1338, Title: #99 Contracts made by ordnance department, 1868 - does not mention any spare cylinders purchased by the U.S. Government during the entire UnCivil War. Unfortunately, my eyes are not good enough to confirm that in the following link:
https://archive.org/details/executivedocumenv11unit/page/n5
Spare cylinders would have had to have been fitted to an individual revolver to ensure they functioned correctly. Further, carrying 1-2 fully loaded cylinder/s would not have been very intelligent, as dropping it might cause it to go off.
FORGET trying to exchange cylinders on the deck of a ship or on horseback in the middle of a battle. Some cavalry units, especially Southron Cavalry, carried two revolvers in their belt holster and two more in their pommel holsters. The extra revolvers were their "speed loaders," just as you did it.
Gus