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Comp testing with close range paper target


Mhall

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I know I've seen something about this in the past, but my GoogleFu is coming up short.

 

Can someone either link to or explain (again) the procedure for testing comp/load by shooting through a paper target at close (3" or so) range to get an idea of the amount of gas coming out the end of the barrel?  Also what are "normal" results and what types of holes are indicative of what things i.e. big hole lots of powder burn vs caliber size hole.  Obviously extremes, but what should a person look to achieve? 

 

Thank you in advance.

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