I am currently building a 7 Mag on a Stiller Tac-300 action with a 26" Obermeyer 1:8.75 twist with a 0 Cant Stiller base and NF 5.5x22x50 NP-R1. I have been researching loads for killing elk out to 800 yds. What do you recommend for powder, primer, brass, bullets? What do you recommend for loads based upon the above? Trying to get 3,00 fps. Thanks in advance.