Sorry for being vague. I should have said most plates are 8-12" but every once in a while you will see a small target in the mix. Locals like to mix in a hostage taker target (roughly 4" bad guy) at a good distance.
Really depends on the match director and how hard he wants to make it. Remember, in Canada, you are not legally allowed to shoot steel inside of 70m with a center fire rifle. So if you're firing line is dynamic throughout the stage, a smart director will place steel at least 70m from the most downrange point of the firing line. Hope that makes sense