It’s just the opposite Jack, the higher quality photo from a side angle shows us that there is absolutely no flare out on the mouth of CE 543. And furthermore, when we now compare the two top view photos of CE 543 and the HSCA test cartridge #2, we can now see how very similar they actually are. I am now of the strong opinion that the rear bridge caused both dents.
You started the thread already convinced because you are an early missed shot advocate, desperately trying to salvage the theory. Nothing more. If you can be convinced by what you have posted you can be convinced of anything and already have been. Just look at your track record on other subjects. There is the assassination and then there is your assassination.
The CE 543 shell is flared at the top and on both sides. Maybe you missed that.
The early missed shot nonsense is never going to work. Look at what that belief has led you to do just on this thread. It is not my lot in life to educate you. It looks like a fool's game to try.