Yes, that may be what both of my M-617s need, polish the forcing cones, will that take special tool ? I wonder if the copper washed is just for looks, I have tried around 10 types of 22LR ammo with no luck, I have a 100 box of CCI SV to try maybe Thursday at the range, I think it will do the same thing, It takes around 30 minutes or so to get that lead off. Think I need to try that polish, thanks for the info..