PACT M7 SkyScreen Complete System

PACT M7 SkyScreen Complete System. The original chronographs dating back to early 1900s functioned by having the bullet cut a piece of wire at the muzzle to start the timing and striking a down range plate to stop it the actual measurement being done by measuring how far a weight fell during the time of flight. Later two wire screens were shot through each causing a mark to be made on a spinning disk the distance between the marks converted into the bullet speed. During WW2 the US Army Ordinance