BGBL87, funny you mentioned Tonica. I grew up in LaSalle but spent all my younger years shooting in the local woods from Tonica to the old LoneStar quarry lands, Bailey Falls and along the Vermillion river. My dad grew up on a farm halfway between Tonica and the quarry, RR1 Ogelsby.
I think the OP mentioned Buffalo Rock Shooting Range, that place is a "dive". Years ago it was a gunshop and reloader supply until the owner got sloppy, and literally blew the place up from powder residue on his reload machines. That was around 86-88, I have a couple pics from that. BATF was all over that place.
Anyway, I left Illinois in 2001 and live in Michigan now, shoot at a decent local outdoor range out to 200 yards, smallbore range and a pistol berm. Small membership fee of $44 gets me the combo to the gate and clubhouse. Very convenient to back in with the truck and spend half a day with whatever I bring.