I hear that there is some guy, DanoInTx I think his name is, that can hit a 1" bull at about 25 yards offhand consistantly with open sights if he is holding his tounge just right :emoticon: :emoticon:
In all honestly though I think about 15-20 yards is probably about the max for most people at a <1" target unless you've got real good eyesight, but as has been said, the bigger the target the longer the distance. Btw:Open sights shouldn't block a target at all if you're aiming correctly, the bull should sit on top of the front post, not be covered by the front post....unless maybe I've been doing it wrong all of these years:)