But Peter, according to the theories...the bullets should be falling at the same speed...and we're only dealing with say, a meter. The forward movement shouldn't matter and the downward movement should be the same because of gravity. If you deal with a perfect vacuum and a perfect plain then in theory they should strike at the same time...? I too used to teach these things and the troops informed me I was teaching physics... Neat...

The first question depends on muzzle height when the bullet is fired. At 48" height, which should be the height of an M1icon Thompson when you fir from the shoulder, the tables are available for bullet drop and trajectory...without getting a pencil sharpener out...