Been bow hunting for a few years now and thought I would get back into the fire arm season. I just picked up a Remington 870, 12 Ga. this past weekend and would like to use it this season for deer hunting. I will be in lower Michigan and state requirements are shotgun only in my area. My question is, I need to purchase the correct choke for use with slugs. Anyone out there know what I should be purchaseing. My longest shot would be 40 yards max. from where I am set up.

Thanks in advance.