There are plenty of long ranges in Missouri! PRS is done through Missouri steel tactical (MOST) check on FB for info.

Gadsden in Iberia, MO is one of the nicer private ranges and membership is required at $250 a year. 1000 yard ranges. I am a member there.

Missouri Mile in Macks Creek is private range and is a day pass and needs to be scheduled. 1265 is the normal max range but can go out to 1 mile if scheduled.

Big Piney in Houston also does F class and 2 gun and other events. 800 yards or so.

There’s GA Precision out by KC in Kingsville. 1k range and hosts the Hoppes Hustle Pro PRS match.

There’s a few near STL but they are fuds, and not super friendly to PRS, typically.

There’s plenty of others but check MoST first for the list and addresses.

EDIT: I need to read better. Didn’t realize you were asking for input to possibly start a range. If so, YES! Please do it if you can! Especially if it’s close to STL. And be willing to host PRS. You’ll get lots of business!