I did some searches and read a few things about the two. I am loading a 7mm Rem Mag with some 168gr bergers. I am using this as a hunting load only, with good accuracy out to 800-1000yds. From what I am reading, Retumbo has better velocity, but H1000 has better ES values. Will the lesser ES values be a huge concern with the Retumbo? There are obviously a lot of people using it so it must work out alright. I am shooting for a goal of 3000fps or so. Thanks for any input you may have on these powders. Thanks again.