Originally Posted by
lysander
Nitpicky, but extraction starts at the end of piston motion (2.5 ms), when the cam pin bottoms out in the cam track. Only then does the bolt start to move.
What we have not taken into account is residual chamber pressure, depending on the timing of unlock there might be 200 psi residual chamber pressure. When the shoulder is uncorked from the chamber this will assist in extraction.
I normally ignore this as one, the force is low, and two, depending on the P-T curve used in the simulation, it sometimes isn't there.
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