Seems to me you need to come up with a uniform test. Be it something like locking down a gun and shooting at a target with a set amount of balls. Measure FPS and then chart the hits on a target. Remove barrel Hone barrel to perfection then repeat with balls from the same case. Done several times should produce some sort of results that are usable.
Regardless of if you get a couple odd paintball's the overall numbers don't lie.
as for the Friction you could take a re-ball pop a hole thru it run some string and pull it out using a force gauge. that would be an easy test to see how much difference a good finish gives. Regardless of the material your % of force should be somewhat consistent.
Last edited by TFrevold; 02-18-2013 at 05:48 PM.