Bear with me as this is my first post on this site. I live and hunt in central Miss. temperatures durng deer season can run from the teens to the mid 70's in a few days, sometimes in the same day. I have a Rem. 700LSS in .338 Rem. Ultra Mag that I hope to use for "long range" hunting, 400 yds. - not to exceed 600 yds. I realize the rifle and I must be capable of delivering a clean killing shot at those ranges so I am looking for loads for this cal., bullet, and rifle that will give me the requisite accuracy, and the velocity to keep the drop minimal. I particularly like the Hodgdon "Extreme" concept for powders, but I am open to others. I have the Nosler handbook and have some loads from other online sources. As I mentioned I like the temperature INsensivity of the "Extreme" but haven't seen any loads for H1000, Retumbo, etc. I believe there is another powder company that offers some powders with a similar temperature INseneivity but I don't know which it is. Any help will be greatly appreciated.