If your not in a bind for ammo you may want to look into the 7mmSTW or even the 7mm Weatherby Mag,might have a bit better wind bucking ability than the Rem mag.
I don't know for shit,but I thought those matchs were for service issued rifles.
They are.....except you can shoot them as a civilian if you wanted to with civilian equipment. I'm not shooting service rifles matches, I am shooting sniper matches. Most snipers do not use the issue sniper rifle that is issued to them....they use their own.