It would be nice to have a rifle you can "turn up to eleven" if you suspect your enemy is wearing body armor.
“It would be nice to have a rifle you can “turn up to eleven” if you suspect your enemy is wearing body armor.”
Penetrating armor has more to do with projectile composition than velocity. Bullets designed for this tend to do less damage on unarmored combatants. Both the current M4/M16 ammunition (M193 & M855) have similar velocities. One has a lead core which tends to fragment, while the latter has a steel core, designed to go through light body armor or a helmet at range.
Always pick the right tool for the job. These ‘one-size-fits-all’ gimmicks are just that. They wind up doing everything poorly instead of a few things well.