Skeet I think you probably hit the nail on the head on the feeding.
Under slow fire, it works great, just did the keyholes under rapidfire. then slowing down on the next target, it did fine again.
Mine is a Model 12CS as far as i can tell, i posted more info on it awhile back in a rimfire thread with a name soemthing along the klines of "what is the difference in .22long, and .22longrifle"
another good page for info pn the model 12' is here
http://www.wisnersinc.com/additional...ington_m12.htm