Missouri has a couple staffed and multiple un-staffed outdoor shooting ranges all over the place. My county has 2 un-staffed out ranges, 1 of which is black powder only.
mdc.mo.gov
I prefer to have a buddy shoot with me at these ranges as they can be pretty desolate.
I mostly use them to check the 100yd zero on my hunting rifles. I will also use them if a friend wants to shoot but not drive to my house.
You can also shoot anywhere in the National Forest as long as you are not near a campsite and clean up after yourself.