You didn't answer the question "does shooting a bullet at 100 fps make sense to you?"
That's the answer I'm waiting to hear.
"Shooting bullets at 100fps might be adequate for taking mice. For elk I use a rule of thumb of 1500fpe. It would take a 10-pound bullet at 100fps to generate 1500fpe. Not very practical and range would suck."
But I'm repeating myself...
If you need a single monosyllabic answer to understand the answer, it would be "No". But using 100fps as I did to prove a point is perfectly valid. If energy doesn't matter then velocity doesn't matter either.