I have owned a DPMS .308 for a couple years now, and although it performs well I think I am ready to spend some money and purchase a quality bolt gun. I need suggestions on what caliber and in which rifle to shoot it. I want to engage targets effectively out to 1 mile. I don't mind a little overkill. I am experienced in shooting as I spent 4 years in Marines. I mostly spent all those years in CQB so didn't learn much about the sniper MOS, although I shot expert every year on rifle range. I think If I can put together an effective bolt gun I can make hits downrange. Any help would be greatly appreciated.