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Old October 3, 2012, 04:25 PM   #18
Denny Hansen
Join Date: June 29, 2001
Location: Prescott Valley, AZ
Posts: 2,404
IIRC U.S. Customs (before it became ICE under Homeland Security) conducted in-depth tests on shotgun barrel length for use in helicopter ops. The concluded that all the powder that was going to burn efficiently would do so in 14 inches.

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