For bullseye, the best iron sights are probably a black front blade, angled back to yield a shadowed dead-black image, in a square rear notch allowing a sliver of light either side of the centered blade. Take a six-o’clock hold with a gun zeroed to shoot into the middle — and it will. Popular sights are usually good choices, and this combo has served bullseye shooters well for decades.

Some months ago I fired a custom revolver outfitted with a fluorescent green bead up front and a shallow V notch in the rear. Fluorescence — in target or sight — can “burn” into your eye and is no help to me in formal target shooting. But I found this revolver’s set-up quite useful afield. It’s essentially what I like on a dangerous-game rifle. A big bead catches your eye, and it settles fast in the belly of a shallow V, which obscures very little of the target, much less than a square notch. Zeroes putting your bullet at the top of the bead afford you instinctive aim on targets of various shapes and sizes at unmarked distances.