My gun club has a long range shooting section that is 500 meters for the longest shot, which has a fixed metal gong type target, along with some smaller metal plate shaped targets. There is one hanging gong at 100 meters and just metal fixed round targets at 200, 300, and 400 meters. I have a piece of 3/4" steel plate that is 40" by 19" that I am going to donate to the club. The metal is oval shaped and I was going to cut it twice and make 3 gongs out of it. If I cut even, than the pieces will be 13"x19". I know this size will be very visable at 200 meters, but will this size be visible enough at 300 and 400 meters to shoot open sights blade type or creedmoor with globe front sights? The ones I will put up will be suspended by chain, so they will swing or twist when hit, plus make that nice sound. I am not a youngster any more, but I can see the metal fixed gong at 500 meters, but it is 18x24.