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HumpMan, you're making my head swim. I'm having flashbacks to my physics classes.
Regarding what FUD was asking for, I think you may have gotten it right with your first post. Some of the action-shooting organizations use a "power factor", which, as you said, is an index of momentum. It's:
{W(bullet) * V(bullet)}/1000
The break between major and minor calibers is 180. Ever notice how the .40 has a 180 grain bullet at a nominal 1000 fps? PF = 180. No coincidence. For the .45 (230@850), PF = 195.5, close to FUD's 200.
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