6.5 Grendel Hunting AmmoThe six.5mm Grendel is undoubtedly an intermediate cartridge jointly built by British-American armorer Monthly bill Alexander, competitive shooter Arne Brennan (of Houston, Texas) and Lapua ballistician Janne Pohjoispää, like a low-recoil, high-precision rifle cartridge especially for the AR-15 System at medium/extended ra