I thought the Kirst for the Ruger is 6 chambers.
That is good to know on the dry firing aspect of things. I hate to admit it, but I am guity as well from time to time of trying for that 7 hole group.
I think I am going to stear away from smokeless powder in general. Besides I don't think those cartridge thingies are ever going to catch on. :P
So then the R&D backplate spins with the cylinder, and the Kirst stays put and the chambers rotate. Do the backplates ever get misaligned or do they lock up pretty tight with no play? I would think they would get moved a bit and then the pin wouldn't hit the firing pin.