I didn't build it, the Ponca City rifle and Pistol club built the range with contractors after being ran off from our location at Lake Ponca for 45 years by encroaching developments in 2008.So you actually built a range. Where is it located. I would like to see it. I want to set up a shooting club with a private range for the club members. Is your range incorporated as a business?
Right now we are West of Ponca City, East of Tonkawa. We are a 501c4 business. I'd be more than happy to show it if your in the area.
You can see pics of the range on our website.
http://poncarpc.org/RPC-photos-2.html
Berm heights, and design were modeled after NRA specifications available online. If the berm height called out for 20', we built it at 25' to allow for settling, and they did settle.