I've been there twice over the years. The hold them in the late Spring and early Fall. It's a few days event and the night shoot is really something special. Quite often they also have a Loach Helicopter with an M60 on board to strafe the field. They also have flame throwers you can rent as well as a complete MG firing line for rentals. It's not cheap but where else can you shoot any of these machines?
There's food there and you can also camp at a KOA just up the road. Louisville, KY is close by so that's fun. They also host NGD (National Gun Day). The center where they have the gun show has........3000.......yep.........3000 tables. There's a Six Flags there, too.....something for everyone.
The Knob Creek facility is part of a larger military site including Fort Knox.
That GE minigun is what amazes me most. There are two of them there sometimes. The pile of brass they create would make your head hurt. They will shoot something like a washing machine and the mass of bullets that hit that machine heat it up so hot that after the shoot all that's left is a molten pile of aluminum. No kidding. The kids will pick them up and save them as trophies.
If you've never been, go. Go once. There is nothing else like it and you'll see firearms that maybe you've only read about. Hell there was a huge cannon there one year.
Rome