xausa makes some good points.

I swapped my open sighted double rifle for the PH's scope sighted .416 Rem when trying to shoot a cape buffalo bull in a herd. The scope made all the difference for trying to pick a shot safe from hitting another buffalo. In the end didn't fire as none of the big horned bulls had hard enough bosses for what I wanted. Some of them looked to have damned big horns in the scope though. But I had set the standard and so missed out.