Thread: 7mm Rem Mag, where do I start?

Hi team, recently picked up a rifle built in 7mm Rem Mag, I had no intentions of buying a new rifle but this thing came up and the price was right so here I am....
I have some dies on the way and I have a pack of federal blue box 150gr factory ammunition I might have to launch at some steel so I can use the brass (unless someone wants to swap me 40-50 brass for the factory rounds?)
I want to work up a load for it to use on Tahr at 400+ and long range steel, I want to be launching at least 160gr of lead into the air as my 270 takes care of anything lighter than that anyhow.
Powders I currently have are 2208, 2209, 2213sc, W760, W780, N560 but I can pick up something different if need be, im guessing i will need "magnum" primers also?
Im more interested in accuracy and energy at 800yards than speed so im interested to hear any suggestions on projectile choice and loads etc... Seems the 162 Amax is pretty popular? (Allthough I also here Amax are being phased out...)
Thanks in advance for any advice.