A closed bolt firearm will not, under any circumstance, shoot farther, all things being equal. However, closed bolt firearms are generally more accurate than an open bolt gun, simply because with a closed bolt, the bolt is at rest at the instant the round is fired. Gas operated semi auto's can have the same accuracy as a bolt-action gun. Using the same ammunition, bullets fired from a closed or open bolt gun would have the same flight characteristics (trajectory, range), although the gun may move a little bit and cause innacuracy.
Now, back to paintball. I think the reason that Cockers and other closed bolt markers were considered more accurate was the fact that they are cloed bolt. In a Cocker, a loaded ball is pushed past the ball detent, so there is nothing to hold back the ball except a proper sized barrel. We all know that paint-to-barrel match is crucial for accuracy. Cocker owners have to use the proper barrel bore size to make sure that the ball stays in the breech. This also means that their guns are more accurate.
Now, back to paintball. I think the reason that Cockers and other closed bolt markers were considered more accurate was the fact that they are cloed bolt. In a Cocker, a loaded ball is pushed past the ball detent, so there is nothing to hold back the ball except a proper sized barrel. We all know that paint-to-barrel match is crucial for accuracy. Cocker owners have to use the proper barrel bore size to make sure that the ball stays in the breech. This also means that their guns are more accurate.

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