I was born in Branard Mn. Just north west of you.
My pick would be:
1. 22long rifle, cheap ammo, easy to store alot and light in weight if you have to go.

2. 30-30 rifle, large enought to get any thing in your state and can be down loaded to get smaller game than deer, buy a Lee Loader and you can reload the shells you have shot. light weight and will take out zombes with no trouble. ammo is easy to find and not expensive.

3. 12 ga. for all the reasons stated by outhers, ammo is easy to get in any area, but heavy to carry alot of it.

now you have my 2cents worth. Isn't this fun trying to deside what to get, If you are married take your wife along when you go shooting, you never can tell, she my like it then you can buy her guns and stuff