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I can't remember my science classes and too lazy to look it up, but is it Newton's law about inertia etc. that when force is applied to move something there is equal force in the opposite direction. When the powder begins to explode and exerts force on the ball to get it moving, there is the same force pushing in the opposite direction. That is the primary reason for kick in a firearm.
Now when the gas erupts from the barrel it will also exert pressure in the opposite direction.
Now when the gas erupts from the barrel it will also exert pressure in the opposite direction.