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Old 11th November 2014, 10:52 AM
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Brian.Samson Brian.Samson is online now
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Join Date: Jun 2009
Member of: Pontefract, Doncaster Airgun Range
Location: Doncaster
Posts: 2,335

I tend to use 32.174 for gravity, which would mean using 450436 in the calculation giving the answer

800 fps with an 8.4 grain pellet = 11.935 fpe

(11.99fpe for an 8.44 grain pellet though)
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