Which chamber for a custom bolt gun?

[Smokepole50]

Well, I did not mean light BR rifle, I meant short action small receiver BR rifle as in Mirco receiver for stiff BR set-up. The Micro size action is also helpful in reducing weight in the Mountain type rifle.

I am sorry, I thought someone said they did not want to hand load for additional chamberings other then .308, 6.5 Grendel and something else. I guess it was not you. Either way that is a reasonable reason to want to stay with the Grendel no matter what platform your shooting it in.