Form,
why is there such a significant difference in reliable terminal effects between 5.56 and 338 Lapua? Let's pick an equal distance for both, say 800m.
You can play that game a couple of different ways. Consider two bullets with identical kinetic energy. The first is a 105 grain Berger VLD shot out of a .240 Weatherby at 10 feet from the muzzle.
The second is a 155 grain full metal jacket non-expanding bullet out of a .308, X distance downrange.
Identical kinetic energy but there's no doubt in my mind which one I'd rather be shot with. How about you?
