Next year I'm going to finally get my hunting license. I currently have an 870 field gun and want to keep my guns separated so I'm on the market to get a deer gun, either 20/12 gauge. I see a lot of guys using 20gauge slugs on deer and it seems like a good move over the 12gauge. Now my options are either a single shot or get another 870 with slug barrel and scope. I don't know any brands that make single shots but I like the idea of the single shot and think it would be more fun. What would you guys recommend? What gauge is more practical for deer?