My company brought a gun & fire control system to WSMR some years back.
Kept nailing the drone every single time, with single rounds. One shot, one kill.
Came to an agreement that our engineers would "zero" the gun relative to the real fire control solution way off the target, but by a known quantity. Then, when the shot was taken, WSMR radar would know exactly where both target & shot went and determine if it was a "hit."