Got the same problem
Parents used to live on 10 acres, took it for granted. I do have an indoor rifle range available but like you said, can't really do your own thing there. I used to see people plink on state land all the time, in the same areas with perforated road signs, but don't want to risk my babies getting hauled off by some DNR officer.
Maybe for now you'll have to make due with following the rules at the range for firing practice and other live stuff like immediate action drill. At home put in the snap caps and do your 'fast draws', BUG draws, mag changes, scenario practice clearing your house, etc.
When you find a place to be your own shooter, then you can do the action stuff. Get some poppers, and paper BG targets with a stand. Shoot your rifle from all positions. With your carry peice, practice the speed rock, off your back, multiple targets, primary to handgun transition. Vehicle related shooting (be careful here, not always legal even on your own property), getting out, drawing and firing while seated. All that stuff could at least show you something you never thought of, buy you time later that could save you.