Can't decide on a 6mm for my new build. I want to shoot the 115 DTACS. I'm looking at .243 win, 6XC, 6x47 Lapua, 6mm Rem, 6mm Crusader. This will be built on the KMW Sentinel stock and Surgeon action. I want to push them fast, but I need reliable feeding from the AICS mags, decent barrel life...