I'm looking at purchasing a shotgun scope. I found one I'd like to purchase which is 2.5 x 20mm. Meaning 2.5 power, does this mean everything will be 2.5 times larger through the scope than with the naked eye? I'm not that accustom to scopes, just wondering. Is this adequate for hunting whitetails with a shotgun. I'm looking at taking shots up to 100 yards, most of the shots being closer to the 50 yard mark. Thanks for any information.

Paul