There's no difference tween the SS and blued models as far as how the accurate the barrels are, mine both shoot very good, but mine are both laminated stocked models, the synthetic forend of the SS 270 with be more of an issue to get to shoot well if it doesn't shoot well out of the box, it may take some experimenting with the forend stud hole and possibly semi-floating it, but it's not as user friendly as the wood or lam counterpart due to the integral spacer.
The frame of the SS model isn't stainless, it's nickel plated, just an FYI.
I'm working with a 270 Ultracomp right now using the 150gr Nosler partition, it will easily shoot moa with IMR4350.
Tim