No max round count. While that was a novel (and realistic idea) we are multi gun competitors as well. The whole idea is to get to shoot! The more lead you throw the better time you tend to have! LOL
YEs, head shots only on Zombies, steel is steel (falling, hanging or called shots)
Some pistol only, some rifle only, some both, some &^%%$$#^@&@*.. we will let that be a surprise!...LOL
If you brought 250 rounds for each platform you should be all set. Just depends on how clean you can shoot while GOING FAST! LOL