Well first of all I may be splitting hairs but I have always disagreed with the term "knock down". Bullets or shot from shotgun shells don't "knock" anything down. They kill by penetrating into vital areas and organs.
Forget the knock down stuff.
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True, end results are penetration, but Hevi even uses the phrase, must have some meaning?
Copied from Hevi-With World Record performance this load offers 40 percent more knock down power than lead and 40 percent more effective range than lead.
And when I first started turkey hunting and knew very little of the sport, I once shot at a strutting tom 15 yards away, and "knocked him down", only to watch him fly away.