I have Remington 700 in 7mm Rem Mag with a 26" barrel and a 1:9.25 twist, this gun is all factory stock except lapping of the bolt lugs. I have been doing some reading on here and trying to decide what I should use to get my first load going. I have narrowed it down to Primers; #210 or #215, Bullets; Berger 168gn, Seirra 168 gn. Now here is the trouble I do not know which powder to use with these heavier bullets. Should I use Retumbo or H1000 or is there something else that is better than those two. Any help or advice would be appreciated, thanks.