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Old May 14, 2011, 12:27 AM   #4
JohnKSa
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Join Date: February 12, 2001
Location: DFW Area
Posts: 18,349
To add to what has been said, if there is no information provided, the assumption is that revolver ammunition velocity is measured with a 4" vented test barrel in an attempt to replicated the velocity expected from a 4" barrel revolver.

It may not be the correct assumption all the time, but I don't know of a better one in the absence of any information to the contrary.
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