Thanks for the info Mike.
From what I've seen, I think things have changed a bit. There are more rules involved. There's a few different classes and shooter grades. Gun wise basically there's stock, modified, super modified and unlimited. These aren't the actual names of the classes, but you get the gist of it. They also rank shooter based on how fast & accurate they are. A, B, C, & D. The group each class within their respective ranks for a more even competition. Something similar to SCCA racing.
As far as getting shot back at... Well, I got enough of that when I was in the service and believe me. It ain't fun. It's a definite adreneline rush but you don't get the dizzy nautious feeling when it's all done.