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Old May 13, 2011, 09:26 PM   #3
jmr40
Senior Member
 
Join Date: June 15, 2008
Location: Georgia
Posts: 5,889
The only way to know is to buy a chronograph. Anything else is just a SWAG. It my be close, it may not. Individual guns with equal length barrels will often show very different velocities with ammo from the same box.

There is no math formula to accurtely predict what will happen. There are too many variables.
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