I had the same Q's so I emailed a couple of ppl and ended up calling the match dir. Hope you see this before tomorrow, see y'all there. Here is the response I got from jthapkido:
Well, there are six stages---so if you never miss, you'll need 150 rounds. (Five shots per string, five strings per stage.) That being said, most people miss more than once, so I'd probably suggest bringing at least 200 rounds, if not 250 just in case.
If you are shooting centerfire, you'll need a decent holster. (Centerfire draws from the holster on each string.) If shooting rimfire, no holster is needed, but you will need a decent bag in which to keep your gun when you are not on the line. In both cases, the more magazines you have, the easier it will be. If you have five mags, that works best. if you don't, make sure to arrange with someone to load your used mags for you as you shoot the stage, to keep things going.
Setup starts around 7:30am, registration ends at 8:40, and the new shooter briefing is at 8:40. Shooter's meeting at 9, with shooting starting right after that. If you get there early, you can help set up, ask questions, take a look at the stages, and have plenty of time to make sure you know what is going on.
Steel Challenge is a good time---have fun!
Sorry if this has been answered. I'm new to the steel challenge. Is there any place that has info about how many rounds to bring and how scoring works?
Thanks!