from: Sheriff Jim Wilson
There is something important that folks need to know about traditional single-action revolvers (the exception being the newer guns with transfer-bar safeties, like the New Model Rugers). If you load all of the chambers in the cylinder and the gun is dropped on its hammer, said gun will more than likely go off. Of course, there is a safety notch on the hammer, but this is a thin piece of steel that will generally break when the gun is dropped. Wyatt Earp and Oliver Lee were just two of the Old West gunmen that learned this lesson the hard way.
FIVE BEANS IN THE WHEEL: load one, skip one, load four more, bring the hammer to full cock, and slowly lower it onto the empty chamber.