[SOLVED] Projectiles, spin, momentum, and range Greetings. I am simply seeking information regarding the matters of the subject line. Here is the situation: A spherical projectile (6mm pellet) is fired out of a device at say 400 feet per second. It is fired out level to the ground (as if you are aiming a gun at a target - no real trajectory above horizontal). To complicate things, a backspin is placed on the projectile inside of the barrel... the backspin causing a change in pressure above the pellet as it spins, thus to some degree counteracting gravity. So if I were to speculate on the different ranges (distances the pellet would travel before hitting the ground) of a pellet fired at 250 feet per second vs. one fired at 500 fps, what all would come into play? Thanks for any input.