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Old October 29th, 2005, 20:44   #2
odp
 
Join Date: Sep 2002
Location: Vancouver
Those are approximate energy ratings.

0.8 Joules with a .2g bb is 293 fps
0.9 Joules with a .2g bb is 311 fps

Obviously there's no guarantee that you'll achieve those speeds, but it's probably a good guideline.
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