Where two circles meet [collide] is a single point. Below is a better image of CE 543. The mouth definitely isn’t flared out. And the dent appears to fit the blue arc of a circle roughly the diameter of the outside of the bridge.
As dented in as CE 543 is, your previous post proves it is flared out. Thanks for posting the picture of CE 543 from the top. Clears this up.
Gave up on your chamber mark theory being caused by the rear receiver bridge? Too ridiculous? Too similar to being a believer in an early missed shot?
