for gun details, please check my posting @
http://www.longrangehunting.com/forums/f18/6-5-284-build-118172/
I have only tried H4350 and H4831SC
I settled on 49.5 Gr. of 4831SC, Lapua Brass, CCIBR2, seated .010" off the lands with 140 Gr Berger VLD... The velocity averages right around 2800fps...