Normally I clean my guns after each practice session. However after the last session, I skipped the cleaning and did some dry fire and reload drills at home. Being the gun is still dirty, some obvious issues glared out. See pictures below. I noticed that my cylinder was rubbing against my forcing cone. I checked the rotation with the cylinder closed and it does not rub. There is no play back and forth when the cylinder is closed, however there is a little cylinder play back and forth in the open position. It only rubs when closing the cylinder. You can see this by the mark pattern on the face of the cylinder. I currently have about 800 to 900 rounds in this gun. Any ideas what could be causing this?