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Just my observations as a person who reloads, I think it has as much to do with the powder you are using as it does whether the rifle is over gassed.  The Tubbs spring may have something to do with it but my bet is the M855 is propelled by a slower burning powder.(Winchester 760 or something similar)  Just my view.  If everything is working well the next big test is shooting in the dead of winter when the temperature is below freezing. 


kwg


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