The faster is moves the faster it stops. - Right.
.. it is often the case that the same bullet driven fast will stop sooner than the same bullet driven slower.
Which of these two loads do you think will penetrate more one gallon water jugs?
1. .45-70, 460g hardcast @ 1812fps, 3354fpe
2. .45-70, 300g hardcast @ 1167fps, 907fpe
The "obvious" choice is also the wrong one. ...
460g hardcast penetrated 9 water jugs, ...
300g bullet, Total penetration was 11 jugs ...