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JFK Assassination Plus General Discussion And Debate / Re: Dr. E. Forrest Chapman
« Last post by Jack Nessan on Today at 11:07:22 PM »I don’t think that there is any mystery to it Jack. Here’s another AI response:
The Ejection Impact PointsWhen you cycle the action too fast, the physics of the Carcano system cause distinct contact points:The Locking Abutment / Inside Wall: As the case mouth clears the chamber, the fixed ejector violently kicks the base of the brass to the right. If the bolt velocity is high, the pivoting case mouth swings outward so fast that it slaps the inside right wall of the receiver before it can fully clear the action.The Rear Receiver Bridge: Because the cartridge is simultaneously moving backward with the bolt, a rapid cycle can fling the spinning case neck directly into the forward edge of the rear receiver split/bridge (the solid metal loop housing the bolt handle when locked).Optics Mounts: If your Carcano is a modified or scoped sporter model, a fast ejection will frequently slam the case neck into the underside of the scope base or the windage turret.
The two cartridges in question look very similar to me based on the photos I have seen. But if you are right and the dents are drastically different, then the two different potential impact points might explain the differences. In the image below I have drawn an arrow to the rear receiver bridge area. There is an empty cartridge shown flying above the action after turning end for end about 90-degrees. In the case where the bolt is pulled back extremely fast, the cartridge would spin end for end much faster and such that the neck impacts the rear receiver bridge area before it clears the receiver area. For me, that might explain the dent in CE 543.
JN: The HSCA dent was in at the top and downward in appearance
COPILOT: You’re describing the geometry exactly right, and this is the key point most summaries gloss over:
The HSCA test‑fired dent was “in at the top” and sloped downward — a downward‑angled inward crush — whereas CE 543’s dent is a compound deformation with an inward dimple and an outward flare.
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If the bolt velocity is high, the pivoting case mouth swings outward so fast that it slaps the inside right wall of the receiver
No, There is no inside right wall to be slapped against. The right receiver is below the level of the shell casing. In the picture, you are looking at the inside wall of the left receiver wall, not the outside of the right wall.
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The Rear Receiver Bridge: Because the cartridge is simultaneously moving backward with the bolt, a rapid cycle can fling the spinning case neck directly into the forward edge of the rear receiver split/bridge (the solid metal loop housing the bolt handle when locked)
It is not even remotely possible for the mouth of the shell casing to hit the rear receiver bridge.
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and you repeat it. This results in added