Pancho:
Rowdy can sure give you the particulars, but I can help with some generalities, I think:
1) Ammo is donated (and everyone shoots the same provided factory rounds) by Black Hills (smokeless) and Black Dawge (BP).
2) Last year the course of fire was 3 mini-stages (pistols only).
3) You need to bring 2 NCOWS legal .45LC revolvers.
4) Well, yeah, it's kinda like a side match, but more. The braggin' rights alone elevate this to several notches above the typical side match..
It's a great event that adds greatly to the excitement of the Nationals.