Now Cat, I do believe you may be talking about high velocity impact damage there, whereas I thought we were still talking about low velocity impact damage!
As a matter of fact I think high velocity impact, in the right place, might be as dangerous as piercing damage but I'm not convinced that a person in a bulky spacesuit can swing a mace/blunt instrument hard enough to be effective - something along the lines of a military pick or sharpened rock hammer (both characterised by a heavy head, producing momentum, and a sharp spike, for the armour piercing properties) might be superior.
Aliensurfer - several pages ago I suggested a rocket projectile (like a gyrojet round) that could fire a shaped charge downwards, much like a modern top-attack missile, propelling shrapnel/flechettes into a small area, unlike a grenade that, on the moon, would have a massive area of effect, far wider than it could be propelled. I consider that more feasible in the nearish future than being able to miniaturise a mass driver gun down into a hand-held gun (Arnold Shwarzenegger notwithstanding). In 40 or 50 years we may get them developed for Battleships or Cruisers, 20 or 30 years beyond that we may get them down to vehicle mounted weapons, but what you're talking about would take a century or two.
A better alternative would be something like a compressed gas powered flechette-firing shotgun - that is something we could do today or tomorrow!
