Sierra has H380 throughout their entire bullet weight lineup for 308Win.
I'm using it in my Springfield M1A and getting excellent match-velocity/2,550-2,575fps results w/ 175SMKs
There are two discussion lines on this subject re Garand actions:
http://parallaxscurioandrelicfirearm...om/topic/37223
and
http://www.jouster.com/forums/showth...or-the-M1A-M14
They come at it from different aspects, but close near the same finding.