Hoping to get started with a build soon for my father’s 75th...will be plinking steel with me and my boys on the farm, working our way to 1000 yds...thinking a 6CM or Dasher, perhaps...one day this gun will most likely come back to one of my boys and the XM would allow for a 6.5 PRC (my youngest is strictly a killer...no steel!)... how will a 6mm cartridge run in an XM? Thanks