Let me rephrase the question a little bit....

In a perfect world, I'd like to use my old turkey gun...it's a Winchester 1300 with a 24" barrel and fiberoptic rifle sights (Williams Fire Sights). The places where I'd be hunting would offer shots probably no more than 50-75yds.

Could I reasonably expect to be able to hit vitals on a deer at that range, with open sights, out of a smooth barrel...................or is that gonna be a stretch?