it's just the nature of the beast. bead only sights are generally not going to shoot slugs to exact point of aim. i have seen an ithaca 66 and a couple 870's that did, but most were off at least a little, at 50 yds. that is why my slug only guns have some sort of adjustable sight on them. would you shoot a 30-06 with just a bead sight? same difference.fwiw, i prefur ghost ring or red dots on slug guns.