Said the 'want-to-be-expert'. Do you know how much power/energy it takes to move that projectile? Do you know how much heat a railgun generates? Heat that damages the rails after it fires a few rounds. It leaves an infrared signature, so that is how it can be located and destroyed. Do a little research before you call people retarded.
"Although many arguments in favor of EM guns revolve around the assumption that greater muzzle velocity is always better, this is open to challenge. Parametric relationships between range, payload weight, and launch velocity show that this is not a strong argument for many suggested EM gun applications. For example, due to lower aerodynamic drag at launch, a slower but heavier projectile may actually fly farther than a lighter faster one, making the velocity limitations of chemical propulsion perfectly acceptable."