Lake city is my favorite go-to brass and I have PMC, RP,Lapua,Nosler,Fiocchi , Win, at my load bench also. I have over 5,000 LC cases.
Nosler has a service rifle section and Ramshot has online load data for your 62,350 psi Nato Chamber also.
http://www.ramshot.com/wp-content/up...dgun_rifle.pdf
http://www.nosler.com/Reloading-Data...69-Grains.aspx
Lake City Brass (Swaged)
CCI450 primers, thicker cups for AR's
IMR 8208 XBR
69 SMK's or 69 Nosler's
work up to 24.0+ grains (Max) to see some really good 300+ yard groups in a 1-9 twist AR