I have 2 Williams sights equipped with adjustable aperature. For front sight I have tried at least 20 different inserts. I didn't expectmy favorite insert would be a "plain ol'" conventional blade. I especially like the one that is skinney and taoered to a point. I set the point at 6 O'clock on the bull and hit center. I mostly shoot a 10 Meter pistol bull aat 50 feet offhand in the basement. Instead of using a spoting scope, I have a video camera on the paper bull and monitor at off-hand location.
I also have a Feinverkbaugh 10 meter rifle. In addition to adjustable aperature it offers colored filters if needed. IMO peeps are the best iron sights matched with hooded front sight that can accept inserts.