I think I broke it, some of my gear is +70 and I only hit for 1 damage now.
When values get too high it seems like you start doing negative damage (indicated by the sword) http://i.imgur.com/nH88HUj.png
there should be an automatic and toggled gun option. like you hold in click for it to shoot zombies instead of it wasting bullets when you least need it.
automatic option does the same thing as the guns do currently.
toggled gun shoots as long as you are holding in click.