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Old September 30, 2012, 02:34 PM   #10
Dave McC
Staff In Memoriam
Join Date: October 13, 1999
Location: Columbia, Md, USA
Posts: 8,812
I seem to recall some tests the NRA did a good while back. They took, IIRC, a Marlin Goose gun with a 36" barrel and chrono'd it, then picked up the hacksaw. Cutting the barrel in 1 inch increments, they'd shoot a field load,chronograph 10 shots, then cut again.

Between 18 and 30", there was more variation between shots at a given length than between 18 and 30". Velocities at 16" almost mirrored those at 36".
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