So I went with 6.5CM for a few reasons. The long range ammo is about the same cost as the .308 equivalent, external ballistics and ability to fight the wind at long range is also an advantage. Also I have 2 AR10s in .308 and an almost completed AR15 upper in 6.5 Grendel. My heavy 6.5 bolt gun is a savage action with a proof research stainless barrel and an XLR industries envy chassis with the full arca Swiss rail. This is a PRS style build I topped with a razor genII with the EBR7 reticle. The seekins havak did have to go back to seekins for a new trigger since the timney it shipped with had some series safety and function issues after less than 100rds.