People have a hard time wrapping their head around the fact that a shorter barrel is more accurate when sight radius is not a factor.
Agreed, with a minor exception. They CAN BE more PRECISE. Accuracy denotes how close the group is to the intended target. So a longer barrel (if it generates more velocity - depends on load and cartridge) will be inherently more accurate, as it will have less drop and be less affected by wind. However, lack of accuracy can be accounted for (adjust sighting system) - lack of precision cannot.
Like most things gun related (or actually, pretty much anything at all) everything is a compromise. It's not as simple as "longer barrel = worse".
Here's another site that does a similar experiment:
http://www.ballisticsbytheinch.com/
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