All of the Game Wardens in my area accept texts. Sometimes they don't reply though. He certainly needed reported carrying that rifle.
I would alert the warden now, and see what he wants you to do. Odds are he will come back to the area, and the warden may have a specific plan of how to handle it that you can help/hurt unintentionallyArchery and shotgun only area. I didn't want to call at the time for fear he may hear me, and go crazy, and even further disturb my hunting this morning. Next time, I'll attempt a text.
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