Picked up a great looking used 686-6+, but I don't think I did a good enough job giving it the once over (excitement got the best of me). When I got it out on the range I had a few light-strikes and a barely-breathe-on-it single action; those I should be able to fix by tightening up the tension on the hammer spring. However - I noticed that I had very uneven staining around the outside of the cylinder - although the soot on either side of the cone seemed pretty even. It's all on the left side just outside the cone and on the outside of the yoke, and I just noticed that the barrel is a little canted. (See pics linked below). Is the timing off, or is the cant responsible? It seemed to shoot very well otherwise. (These pics taken after 40 rounds through it)

This is my first "big" revolver - my little 642 was bought new and behaves very differently, obviously.

Any advice? Thanks in advance!

Pic1-Left Angle: LeftAngle.JPG - Google Drive

Pic2-Left Side: LeftSide.JPG - Google Drive

Pic3-Right Side: RightSide.JPG - Google Drive

Pic4-Cone: Cone.JPG - Google Drive

Pic5-Top: TopShot.JPG - Google Drive