Hi, I just got a 7mm Rem Mag rifle, factory barell, 1-9.4 twist. Tried the rifle last week with Winchester Super X 160gr - 0.70in group at 100yrd. After I run a few numbers on exball I Shot at 400yrd, and 630yrs at 6-8inch rocks after just 6 round at 100yrd and HIT IT ALL THE TIME. I run out of ammo to tried at 700 - 800 -900yrd So I want to give a chance to this rifle. OK I have the following reloading stufs: Rem Brass 250 CCI Magnum - Primers 168VLD Target Bullets (300pc) H1000 Powder, RCBC FL (Full Lenght) resize dies. What is the starting powder and max? Where I can expect the best group? What is the OAL and OFF LAND best spot for this combination... Any imput will be welcome. Please note I want to use this rilfe for hunting deers and coyote (no need to save the furr) at 700 - 900yrd. Past this distance I have my 338edge with the 300 PILL.