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I will note that the old guns (pre-WWII or even older) often had "barleycorn" sights, very fine and/or pointed front sights and small V notch rear. Those guns were intended to be sighted with the top of the front sight centered on the target and the very top of the front sight down in the rear sight notch (what the old timers called a "fine" sight. Bead sights were usually teamed with a U or semi-circular rear notch and the round front sight bead was held in the rear sight U.
As for the shape of the front sight as seen from the side, it really makes little difference except that some sights will have less glare than others. A "half moon" front sight will often be 1/10" or even 1/8" wide and with a flat top, so it will require a normal Patridge sight picture.
Jim
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