Please excuse my noob question and my bad english.
Can you kindly tell me the correct meaning of the "observed velocity" term, as per Maj. Burrard (and Eley Hawk too)?
I'm not sure if it represents the pellet charge average speed from the muzzle to 20 yards, or only the speed at exactly 20 yards.
BTW, Burrard's books are outstandingly factual and interesting, at least IMHO!
TIA,
Maxm (from Italy)