RE: Ruger Super Blackhawk
This is my guess as to what you are refering to.....
The old style or 3 screw as it was called the hammer rested on the firing pin so it was recommended that when you carried the weapon you rested on an empty chamber ( like a colt SAA) The new model has a transfer bar safety and you can safely load and carry the gun with all six chambers loaded. I had a "new model" super blackhawk they are a nice gun.