We're flexible about equipment at practice. Shooters can use what they have.
You shoot 5 steel targets, shooting against the clock. You shoot 5 times, and drop your worst time. So you need 25 rounds if you don't miss. You load 10 rounds per magazine, and you can start with one round in the chamber. Most people use 5 magazines, so they always start with a full mag. If you run out of magazines, you just stop shooting and go to the reloading table. No big deal.
If you're not an HSC member, you can join HSC, or you can volunteer to coach an SSC team for your town. SSC coaches can shoot as my guest, until they get their own HSC membership.