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I mean very specifically, changing ONLY the barrel length in a setup:
both promtheus barrels
both the exact same hop chamber and rubber
both have the exact same muzzle energy on the same weight of BB
both will perform the same until the longer barrel fouls first
Longer barrels use lower air pressure applied over longer time. Because of the lower pressure, it takes more length for that BB to stabilize. But ultimately, the BB leaves both barrels in a straight line.
One of the things that makes short barrels better IS the higher air pressure, as it evacuates the barrel faster, leading to less fouling.
The ONLY scientific influence that leads to the idea that longer barrels are more accurate, comes from real firearms. But real firearms operate on some VERY different principles when it comes to achieving range and accuracy.
The fact of the matter is that a short little 3" pistol barrel is enough barrel length for a BB to stabilize to the point where it can be extremely accurate at it's maximum range. My won USP compact after getting Rhopped was shooting 6" groupings or less at 160ft. I'll be damned if I could ever get that kind of accuracy without bracing the pistol against something, but the pistol was damn accurate lol
The reason why that's not a very common fact, is because your own personal shooting skill has far more impact on the accuracy of a pistol than the pistol itself.
And unfortunately, the tight groupings don't become really obvious until you're engaging well into the range of the hopup. In the IPSC courses, you're generally not shooting far enough to really need hopup. So it's not a really good shining example of how accurate a pistol can be.
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