My jennings 22 will only shoot cci. Anything else and it double fires. And if I don't make darn sure I pull the slide back all the way when chambering the first round it will fire. The round is chambering before the sear catches the firing pin and when the slide goes forward, caboom! And if the load isn't hot enough to bring the slide back far enough, double or triple shots!!!
I would sell mine but it's un safe and I won't sell an un safe fire arm to any one.