From being an officer of a different kind of club, I can tell you that "Tactical Timmy" exists in every hobby. Don't let him ruin your enjoyment of something that you're doing primarily for you, and secondarily for others.
You really have three options:
1. Blow him out of the water so that he doesn't come back (i.e. make it very clear that he can find a lake and jump in, he's a guest and a rude one at that).
2. Get your stuff together if you're going to bill your match as one sanctioned by and adherent to a governing body that people want to be affiliated with.
3. Invite him to stay and eat what is put in front of him with the understanding that it's not a rules-governed event and liberties will be taken. Now that you've made full disclosure, he'll choose to stay and shoot or go somewhere else.
"Volunteerism" is a dying philosophy and our sport NEEDS people who continue to give of their own time for the survival and advancement of the sport. Guys like TT have no clue, no gratitude and you can't let him ruin a good thing for you or anyone else. With that said, you need to sell what you advertise and advertise what you sell, if you know what I mean.
I thank you for being willing to put in effort for something that others get to enjoy.