We always pulled targets at Memphis and then they purchased ar500 steel plates. They paint them white and spray a small gray dot in the middle and everyone gets 5 minutes of sighters on the first relay and 2 minutes on the second relay. They are placed in front of the target frames on the berm and repainted after every relay. No one has to be in the pits and makes life easier on everyone. Clay birds will bust, spray dirt everywhere and it will be hard to tell exactly where your zero is. Pulling targets is not a lot of work in my opinion, so if steel gongs are not an option I would opt for pulling targets.