I know this is an old post but Coastal Mountaineer showed one very important point. Slug guns have a very long push in their recoil. Because of this one should think seriously about eye relief. If you have never experienced "scope eye" then pray you never do. I know the few times I have experienced it I bled like a stuck hog. That longer eye relief built in to most slug gun scopes is a necessary thing in my opinion. Even your hard kicking magnum rifles don't have that length of push in recoil. While standard good quality rifle scopes can easily withstand the recoil of a slug gun, your eyebrow may not like the results of your typical 3" eye relief offered in most rifle scopes.