this all came from Hornadys 2011 catalog.but I think I read some where that the 225gn bullet is a little more from what some of the guys are getting from testing that one bullet.and out of a 300wm.I think it was at snipershide not sure though.
but for me I run the 208 A-max with H1000 at 76.0gn's.even tested one more time and got better accuracy at 75.4gn's putting the bullet just into the lands of my rifel.
some at snipershide are useing H1000,R22,and Retumbo for the 225gn bullet.just need to give a few a try and see for your self just what your rifel likes.for the most part H1000 will do you good for the 208gn A-max.cannot see anything any better in my rifel with that bullet.( 208 )it just shoots for me.and with testing in the hotter months it keeps together for the cooler months which means temp is not a big deal.we go from 32-100 in our area.( S.C. )
hope this helped you out