Never underestimate a Zombie.  If you want to have some fun, IF you can ever find a combat shoot where they aren't to full of themselves,  and will let you, enter one.  It's a lot of fun and I guarantee, will make you a VERY humble person once you review how you did through the course. 
Oh god, you saw my initial shooting results..I'm humbled enough!  I did a lot better last night though...14 out of 20 in the black...baby steps...