After trying that type of shoulder "carry" with my side lever gun, and looking in a mirror, I can't see how a side lever on the left side, carried upside down, would jab me in the neck. I understand that mine is not on the left side, but in order to place a gun on my shoulder far enough to the rear for the lever to contact my neck I would have to place it further to the rear than where it carries well. It becomes out of balance with the rearward pointing barrels pulling down, and my wrist and arm are cramped by being so close to my collarbone. This is assuming that we are talking about the hand gripping the wrist in a normal fashion and the trigger finger outside the guard. I would never carry a gun over the shoulder like that, preferring for it to somewhat balance. With most guns balancing near, or slightly forward of, the hinge pin it places the side lever well out front of your shoulder or neck.
When the limit is filled and the walk back is considerable I will often carry the unloaded gun on my shoulder muzzles front and right side up, with the bottom of the forend resting on my shoulder. I grip the barrels forward of the forend when carrying like this, and only when there is no one in front of me for the muzzles to cover. An unloaded gun never shot anybody, but I don't want to cause someone concern by covering them with the muzzle(s).
SRH
