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Old September 25, 2012, 08:24 AM   #4
spacecoast
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Join Date: October 14, 2009
Location: Sunshine and Keystone States
Posts: 4,049
The formula is Energy (foot-lb) = Weight (grains) times Velocity (ft/sec) Squared divided by 450395 (fixed constant).

(from http://www.reloadammo.com/footpound2.htm)
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