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Old May 26, 2013, 01:05 PM   #4
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 18,483
Quote:
But hey 90 grains is 90 grs. so I've been told.
First thing is, you have been told wrong.
The grain is a unit of weight, not volume, no matter what is marked on that measure. By using a finer grain and shaking it down, you got in MORE POWDER. Then think about easier ignition and faster burning of the finer granulation. No wonder your shoulder felt it.
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