What I am seeing in your photo is not abnormal in my experience....what you are seeing on your primer is not cause for concern IMO.....as pointed out in previous posts, reading primers can be misleading, there are a host of variables...such as how loose the primer pockets are....I have old brass that the primers fill the primer pocket and there are no rounded edges to the primer cup....simply flows and fills the primer pockets....if the primer flows back thru the breech face, it will form a "nipple" that will arrest the movement of the cylinder and tie up the revolver.....this usually requires the wooden mallet....and the "nipple" will be sheared off from the primer cup when you force the cylinder open...that is not what I see in your photo.....I have had this happen with magnum brass that had reached it's end of magnum loads........the load you are shooting is a max load and is unpleasant in short barrel K frames...as you discovered.