NOT an expert here . . . .just an observation. The shot gun recoils and takes anything touching it on that rearward journey. Including the the left hand which is on the slide, and now moving with everything according to recoil. Wouldn't you have to increase racking speed on the left hand to compensate what your letting the recoil do, by over exaggerating? If your moving backward, the slide also has to move backward FIRST. . . . thus more overall movement. has to do with the rise of the moon over the third ocean . . . I think ? ever done a "hard rack five" while traveling backward !
With enough practice time you can get real good with a short stroke Winchester pump and not put it up to your shoulder. Watching a Pakistani soldier who was half asleep on top of an armored carrier at the K4 circle in Mogadishu. That area was known for it's fire fights, check the bullet holes and scars on the building.
short stroke winchester can't do a true "hard rack five", don't believe they're build like the ole Ithaca's. If memory serve me . . .
