I do not mean to direct people away from this site, but these is quite a discussion going on at AR25.com. It would be nice to get some more 300 whisper views represented there. The group there is VERY 6.8 SPC focused.
Here is the link
(AR-15 » AR Variants » Why 6.8 when 300 whisper is available.)
http://www.ar15.com/forums/topic.htm...f=121&t=351653
By the way kogashuko started this by asking the same question on the ar15.com site
320pf