Randy's above is a good piece of work resulting from proper detached study.
I would add that IMO consistent taper crimping requires highly consistent trim lengths on cases, as a few thou longer or shorter will materially influence the effect on retention. In my target shooting days, I didn't think the advantage worth the additional effort - it may have paid off if I'd done more at 1000 yards or over.
Regards,
MikB
...history... is, indeed, little more than the register of the crimes, follies, and misfortunes of mankind. (Edward Gibbon: Decline and Fall of the Roman Empire)