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Old September 17, 2011, 12:01 PM   #6
Jim Watson
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Join Date: October 25, 2001
Location: Alabama
Posts: 11,008
The rest of that rule of thumb is that +5% powder = +5% velocity but +10% pressure.

Do not use any such rule of thumb or even a more precise formula to extrapolate beyond tested limits. OK to interpolate between tested high and low.
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