I live in the middle of the woods in the middle of the frikin' U.P. and would for sure make a stand on the home front. Yes a smaller cal in the head would kill, but zombies are pretty tough. And I want to take the zombie head clean off, not just put a hole in it, thus the .50 cal. A 20ga is Ok, but I think there will be better 12ga 00 buckshot and slug availability in the long term. Thus my choice for 12ga. A pistol grip synthetic stocked riot shotgun is pretty dam light and fast. Another plus for the shotgun is I can reload my spent hulls pretty darn easy and fast. A hearty supply of booby traps set around the property will alert me to the approching zombies. I think zombies will take the path of least resistance, my property has very well positioned funnels that will concentrate the hordes into my shooting gallery. Defense recap in order of distance. 1) perimeter Booby traps, 2).50 cal , 3)shotgun for defending the front door, 4)sword for once they have breached the front door.
WOW, Panda, can't wait to meet you this weekend!!