You're quite right Miscue, the ball eventually outruns the propelling air source as the air reaches its maximum expansion and the ball will continue forward under it's own inertia. Depending upon the distance that this occurs in, there is potential that the ball will create a vacuum behind it as it outruns the expanding air. At which point this occurs depends upon the volume of the air used to propel the paintball and the paint to bore match.
What the porting and the larger bore diameter do is relieve the pressure infront of and behind the ball so that ball is not pushing a column of air down the barrel and pulling on a sucking vacuum behind it, both of which will cause additional drag and loss of FPS at the barrel.
A side benefit of the porting and the larger bore is to quiet down the noise level of the firing process, the longer the barrel/porting, generally the quieter the marker's report.
-Evil Bob
What the porting and the larger bore diameter do is relieve the pressure infront of and behind the ball so that ball is not pushing a column of air down the barrel and pulling on a sucking vacuum behind it, both of which will cause additional drag and loss of FPS at the barrel.
A side benefit of the porting and the larger bore is to quiet down the noise level of the firing process, the longer the barrel/porting, generally the quieter the marker's report.
-Evil Bob

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