I think you misunderstood my post.......
The "Rule of Thumb" on any "Old Model" Ruger or Colt or Colt Clone, etc. is to NEVER lower the hammer down from the "half cock" or "loading" position. Always pull the hammer to full cock, from half cock, when you are done loading or unloading the "old style" Single Actions.
Following this rule will prevent the cylinder ring.
"At Rest" is the position the hammer is in when the cartridge has been fired or when the hammer is lowered over that empty chamber WE ALL use when carrying loaded "Old Style" Single Actions (and some "new fangled models, too!)
PS One more rule prevents the dreaded "bullet in the foot/leg/friend, etc."
Load one chamber, roll the cylinder to the next, skip it, roll to the next then load one, go to the next, load one, go to the next and load one, go to the next and load one then pull the hammer to full cock then gently lower it down over that "empty" chamber you skipped.
Load one, skip one, load four, cock the hammer then gently lower it down over that empty chamber.
A rule to ALWAYS follow. Period.