Sounds like you're SOL then.Not really worth it since I move like every 2 years and all the WMA ranges won't let me shoot 50bmg there.
Most pay/public ranges arent going to just cut someone loose with a 50BMG...
And I can't image the kind of person that would invite someone out to shoot that on their property. Liability city!
Stop moving around so much and join a range to shoot your "specialty" firearm.

