@biometrician,
Check out Brothers in Arms in Hattiesburg. It is in 49S just south of Rose's (49 and 98 interchange). Theu routinely host 2 gun, maybe 3, have lots of pistol and rifle ranges, although I'm not sure on distance, best guess is like 100 or 150. They also have a corner range that is kind of a free for all within reason. Allows for shooting and moving. Owners are LEO or LEO instructors. One guy there is a really great pistol instructor that can have you ringing steel at 100.
There is also a 100yd range in Brooklyn. It is in the national forest. No targets or target stands, has covered benches. I use it for zero and practice run and gun myself. Just please pick up your trash there when you are done. Me and 2 buddies went and filled 20 contractor bags up before we quit. Place was littered with pallets, appliances, and even a window from a humvee.
For distance shooting and nighttime shooting hit me up when you get here. I shoot in my backyard at night under nods and thermal, also have a few places worth popping a few hogs. Other local info I'll tell you face to face.
ETA...if you do wind up moving here, let me know ahead of time. I know a great realtor and the 3 of us can put you in the right area as far as schools, commute, etc