Steel plates will be presented during some stages. NO STEEL CORE AMMO ALLOWED. If your ammo doesn’t pass the magnet test, you can’t shoot it. This is to keep steel plates in good condition. Generally they are 6″ diameter, but can be obstructed/hidden by course obstacles (Example from last year would be 2 steel plates hidden behind a barricade to represent a pillbox).
Usually the steel plates will fall upon impact, but if it doesn’t, it will still be counted as a hit as long as the RO calls it a hit, at which point you can move on to the next target.