This is a new,only been to the range twice revolver. I've only put maybe 70 or 80 rounds through it with the cost and availability of ammo. Single action no problems at all. Double action firing fast seems to be no problem. Double action firing slow 1 of the 6 rounds I get a light primer strike. Just about every time and hitting it the second time still won't go off. I have checked the strain screw and it is tight. Anything else I can try? Don't really want to send it back to Smith Wesson but I will if I have to. This is with 2 different brands of ammo.