Everybody knows that you're supposed to carry an older Single Action revolver with the hammer down on an empty chamber to prevent an accidental discharge, but damned few people nowadays know how to do it.
It's real simple:
Load one chamber, skip one, load four and without moving the cylinder, bring the hammer to full cock and lower it on the empty chamber.
If your revolver has been modified to carry 5 rounds, load one, skip one, load three and bring the hammer to full cock and lower it.
Damn, I miss my old 3 Screw Ruger.