Howdy Again
The 'safety notches' for want of a better word, on my R&D cylinders are useless. The hammer nose of my old EuroArms Remmie is too fat to fit into them. I could always grind down the hammer nose cheeks a bit if I really wanted to, but since I only use it in CAS, where only loading five rounds, not six, is mandatory, I simply only load five rounds and let the hammer down on an empty chamber.
You will notice there are 'viewing windows' cut into the sides of my cylinder. When I bought it, it would not accept the wider rims of Schofield shells. Schofield rims run about .520 in diameter, 45 Colt rims run about .512 in diameter. The cylinder is chambjered for 45 Colt, but as I said earlier, I prefer to shoot the lighter 45 Schofield round in it. So I took the cylinder to my favorite gunsmith and had him open up the counterbores for the rims enough to accept 45 Schofield rims. While he was at it I had him cut through to the outside diameter of the cylinder to create 'viewing windows'. We decided to do this because the steel would have been very thin there anyway. This allows me to see which chamber is empty from the outside, unlike a Colt, you cannot tell where the empty chamber is by looking at the side. I don't know if they took the hint from me or not, but I understand the six chamber 45 Colt cylinders that Taylors sells now include this feature, and can chamber 45 Schofield as well as 45 Colt.
This is actually another cylinder for an Uberti 1858, but you get the idea.
Some of the original conversion revolvers made by Colt did in fact have 12 locking notches on the cylinder rather than six. This was so the cylinder could be locked with the hammer down between chambers.