300 aac blackout for heavy metal?

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The 3 gun rules on the website for the OKC Gun Club say .308 win (7.62 x 51 NATO) or larger. 300 blk makes major rifle for USPSA Multigun, but I believe the OKCGC 3 Gun matches follow a modified version of IMG rules which require .308 win or larger.
 
USPSA major PF and the division of heavy metal are different animals. I also believe the PF for HM is prohibitevly high for intermediate cartridges. IIRC HM requires a PF of 360.
 
http://bulletin.accurateshooter.com/2011/10/horner-wins-tactical-optics-divison-at-multigun-nationals/
 
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