Found this interesting feat while trolling the SRD, but I'm little confused by it vagueness; http://www.d20pfsrd.com/feats/combat-feats/bounding-hammer-combat
It only says you can do it with hammers, yet doesn't define what qualifies AS a hammer. I'm starting to wonder if a Mace or club would count as they are in the same class of weapon as a hammer, even a Piston Maul would count as maul is just another word for hammer.
Any thoughts? Or should I just leave this feat's exact definition to GM's discretion?