“Slug guns and ammo have gotten a lot more accurate in the past decade or so, but even with a rifled barrel there simply isn’t going to be any practical difference between a bolt-action “”slug rifle”” and a rifled barrel on your Benelli, particularly with open sights. The biggest difference might lie in the trigger. Many shotguns have triggers that work fine for scattergunning but don’t have the crisp pull necessary for good slug placement. If the trigger pull is good on your Benelli, buy it a new deer barrel. “