I was going to give the smart a** answer of joining the service for a couple of years but Mike and Amalgam beat me to it.
Seriously have you thought about the simple approach and going to your local class III dealer and asking if they know anyone? I like most "gun nuts" always enjoy showing off my toys.
If you offered to supply/buy the ammo surely someone in your area would be willing to let you play with theirs. Maybe you've got something they'd like to shoot. I've got a friend that drives me nuts bringing his full autos to my house to shoot because I have my own range. Some times you can get too much of a good thing.