I built two semi customs that are basically twins, one in 6.5 creedmoor one in 280 ackley. I say 6.5 creedmoor for what op described. Both are great rounds, but the ackley is definitely a hand loaders game. I'll throw in a curve to op, lately I have had a hard time putting down the third almost matching rifle to the group.....it's a split the difference cartridge, the 7mm08.