I used to belong to a CMP group that ran 4-5 shoots per year at Camp Butner. The range we used there had angry ivan pop up targets out to 900m, so we always had a mix of machine guns and long range gas guns/bolt guns. Unfortunately the core group that ran it for 20+ years moved on. It's a good bit of effort since you have to provide a medic and two RSOs who have to go through a training session at Butner, and obviously can't shoot. You can rotate these people out, but that means you need additional people who have done the training. On top of that, you have to pay for insurance and arrange for a port-a-potty.
I have considered taking the group over multiple times, but it's a lot of time and effort. For now, I meet up with a close group of friends at Woody's or H2O when we want to shoot machine guns.