re: the forcing cone. Bell's study (here about 1/3 way down https://docs.google.com/document/d/1ZIo0y746UsSRZIgRuuxwAbZjSBHitO_EanvwLYc-kGA/edit ) does suggest that forcing cone lengthening will decrease chamber pressure slightly (more volume = less pressure).
As you know, pressure generates speed, but is not part of the recoil equation.
Contrary to the early marketing hyperbole, the consensus today is that cone lengthening does not lessen recoil, felt or otherwise.
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