Re: Noveske Chamber specs???
That is Noveske's "proprietary" chambering designed specifically around M118LR ammo.
I have run a huge variety of ammo through the N6 barrels in various lengths from 16" to 21" and they all ran everything from 147gr surplus through 175gr commercial and my reloaded ammo very well. I think that Noveske advises using only "NATO pressure" rounds through the barrel, but I have never noticed a difference with FGMM, BH and other commercial .308Win ammo.