No express rifle guy, but I do use irons more than most. PNW heavy timber on an overcast or rainy day...I've tried a lot of styles. My favorite is a military style broad post or black patridge. I take a jewelers saw, Harbor Freight 14 bucks, cut a tiny vertical slit dead center on the black face....paint the saw kerf very carefully with ProTec lure paint...plain old white. Gives a low light precise repeatable aiming point. A flat top deep fairly wide rectangular rear, imagine an exaggerated patridge pistol sight, enhances the sight alignment. I hate fiber, to my eye it's just a colorful shotgun bead, and about as precise.
