While my nearest neighbor is about 100 yards away, I use my gaarage for working up loads and chronographing. Wooden box about 3'x2' with dog food bags filled with catalogues, magazines, and other material. The box sets on a wood bench about chest level at the back of the garage. There is a metal plate behind the box with a slant just in case.
The chrono is set up in front of the box and to gain 25' feet, I stand a couple of feet outside the garage.
22LR, 9MM, 45ACP, 38Spl, 32 Auto, and cowboy light loads from Blackhawks and Winchester 1873s.