Yes, there is a maximum ratio of steel-to-paper found in the IDPA rulebook.
Short version: In the longest possible IDPA stage with 18 rounds required, no more than four of them can be on steel.
This is a rule that we violate occasionally at the local, club level. We have a full Steel Challenge setup here that's always hanging around, and every once in a while there's an all-steel stage.
It's nice to travel to a major match where you find 4 distant poppers, and not be among the guys who are worried the instant they see it.
Last edited by ecmills; 03-17-2010 at 17:16..