Last year I acquired a S & W target pistol. It is new and found that it will not fire CCI long rifles or other "cheap" ammo. The mag will allow the cartridges to spring out . It does like Remington Thunderbolts. The problem is that it will fire three rounds and then after that the firing pin will slightly dent the cartridge but will not fire it. I cleaned the heck out of it and it still performs in the same manner very consistently. Any suggestions?