Each individual barrel will foul differently. Even thought he .300 WM has more velocity (theoretically) the barrel could be smoother and collect less fouling. Different powders have different pressure curves. Differing pressure curves lead to different accelleration rates of the bullets in the barrel. This can lead to differing levels of fouling. It is impossible to say if the bullet has anything to do with the equation as they are different guns. Kind of an apples/oranges situation.
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Last edited by robocop10mm; 08-31-2010 at 10:16 PM.