With the Lyman rear aperture sight your eye automatically centers as it seeks the most light. The front globe sight comes with a number of insert displaying posts or rings. There is one ring, that at 50 yards, is the exact same size as a black 3 inch target. If your sight picture shows only black it means you are very much dead center on that target left and right, up or down you are Right On. If your rifle is tweaked to where you are capable of one hole groups, you will get them with that insert and that target. After a while you get so used to that front globe sight you will enjoy shooting with no inserts at all. I’m not sure if that would be cheating but it’s fun unfriendly competition.