Regarding patterning shotgun. Of course you can do this at the gun ranges, i don't know if Happy Hollow has a pattering board or not. BUT, you can go to any state hunting land and post up a target, i use poster board, step back 40 paces and shoot your shotgun. I don't know if you need a hunting license or not.
If you are in Tulsa and want a place to do it for free, let me know.
If you are in Tulsa and want a place to do it for free, let me know.