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I've made and tested many "skull-crusher" butts and pommels, because they look really cool. But I seldom make them anymore... mainly because it's just as easy to crack a coconut or break a window with a "normal" butt of a knife, as it is with a specialized extended/exposed tang that collects extra dirt and might annoy your hand or dig into your ribs when you carry it on your hip. The force applied is very nearly the same either way, so why make it more complicated than it really has to be? Unless proven otherwise, I almost always follow the KISS principle... Keep It Simple, Son.
What I do often do, in the interest of thumping on stuff, is shape the butt of a full-tang knife so the metal of the tang hits your tent-stake (or an enemy sentry's skull

) before the handle material does. I doubt that makes very much difference in the practical PSI applied by such a blow. But it
may help prevent the corners of the handle-material from chipping or splitting, and it looks good to my eye.