My preference is for an aperture rear sight and white bead front sight. The specific configuration depends on the application.

For close cover I prefer a fairly wide rear aperture on a fixed rear sight, with a large bead up front. An adjustable rear sight is fitted and the gun is fired and sighted in. When the correct point of aim is found, carefully measure the height of the center of the aperture above the bore. Measure and drill the aperture of the fixed sight accordingly. Remove the adjustable sight and install the fixed sight. Adjust for windage by drifting the front sight.

On a stalking rifle I prefer a somewhat smaller white front bead, and a rear sight that is adjustable for elevation via finger knob. I also use a Merit adjustable iris to bring the front sight into focus. I like to fit a block of steel under the rear sight when it is at the 100-yard setting. If the sight gets bumped, it is less likely to bend. It will adjust up off the block of steel for longer shots, and can be immediately returned to the 100 yard zero by adjusting it down until it hits.