I have a quick question for anyone that can help, thanks in advance. In the Glock M course there are four D1 cardboard targets, two at 10 yards and two at 20 yards. Except for pictures on the internet I have never actually seen one of these targets. My question is, how visible are the black rings on these targets at those distances. Are they pretty noticable or do shooters just "know" where the rings are? Thanks.