To propel a projectile.
l would use aluminum
The rocket powered projectile does not have to be in a gun.
Projectile speed, projectile expansion, and projectile size are a few factors that determine intermediary range of a gun shot wound.
When a gun is fired, the projectile goes one way, the gun goes in the opposite direction. That is recoil. Recoil velocity would be the speed at which the gun moves when it recoils. Since the gun is heavier than the projectile, it will recoil more slowly than the projectile moves.
A cap gun has no projectile- airsoft does.
The size of the projectile.
Oellet
No way to answer without knowing the weight of the weapon, weight of the projectile, velocity of the projectile
A railgun is an entirely electrical gun that accelerates a conductive projectile along a pair of metal rails. Railguns use two sliding or rolling contacts that permit a large electric current to pass through the projectile. This current interacts with the strong magnetic fields generated by the rails and this field is what accelerates the projectile.
Projectile, bullet
Not sure if this is what you mean, but a sight is a device on a gun or other projectile weapon that indicates where the projectile is going.
No. A starter pistol does not use bullets. It uses blank rounds, which explode and make the noise, just like a regular gun, but no projectile comes out.