Mrs. 2ndAmendmentNut picked out a 6” blue Security Six a while back. Lots of holster wear on the outside, a new gun on the inside. She really enjoys shooting it, however there is a pretty noticeable problem. At least one out of every 12~18 shots the trigger will be very difficult to pull do to cylinder binding. It appears to be do to either lead, powder residue, or copper fouling, building up on the face of the cylinder, making the barrel cylinder gap very tight. Problem occurs with boolits and bullets. I have noticed that on the front of the cylinder on about one half the bluing is starting to wear off, this is also the one half that when rotated into battery the problem seems to usually occur. So I am guessing my problem is the gun does not have an even or proper cylinder gap. Any other ideas? Any advice on how to fix this? Something I could do with a little 400 grit sandpaper on the cylinder face? Or is this best left up to a professional?