Originally Posted by Keebler
If it's directly from an mfg you can't trust it and their testing looks pretty bunkd
Can't review their data at the moment, but the overall idea of a different optimal barrel length for a different gun holds some water. A large volume chamber/low pressure/high dwell gun will most likely operate better with a longer barrel while a small chamber/high pressure/short dwell gun will be better off with a shorter one.
That's for efficiency though. So far as FS accuracy goes, I don't think enough testing has been done in the area to really provide any conclusive answers. I would tend to believe that a 10-16" barrel would be best though, or at least better than anything longer/shorter.