Almost forgot to post the video of me shooting steel at 400 with the .308 while I was on vacation:
That range is near my folks' place and has berms every 100 yards out to 400 with MOA steel swingers at 200 and beyond. It has good covered benches and has the machinery for movers when they run club shoots. It's been deserted every time I go, and if there aren't any events going on then it's free to shoot as long as you clean up after yourself. I still drop some cash in the donation box because it is really a clean range.