I've had occasional problems with two of my Ruger revolvers, a New Blackhawk and a Police Security Six where rounds fail to fire as if the hammer isn't striking the transfer bar hard enough or the transfer bar is, somehow, not passing the pressure on to the primer. I've given the unfired "duds" to various others who happen to be an the line at that time and every "dud" has fired as was originally expected. None of these other guns, revolvers and semi-autos, were Rugers. The rounds were both 9mm and 38s with CCI primers. The NBH is nearly new while the Security Six has had some but not a lot of use, carried by a security guard originally. I strongly suspected the primers until I passed them around. Any others with this problem? Help/hints?