You were clear as a bell, and that's the way I understood the terms, but wasn't sure why Poe would bother to mention that five rounds in the cylinder was standard if that was already common knowledge at the time. That's why I was confused and thought maybe you were using the Billy the Kid account to show that the gun he used had five rounds in it, and thought maybe you weren't recounting the terms correctly. Not everyone uses terms like "live cartridges" correctly, so it doesn't hurt to make sure.
Interesting contribution. It would sure be nice to see Poe's exact words.