Re: Barrels
It's very likely that either of those two barrels, when properly installed by a good rifle builder, they're going to both outshoot the owner.
I've owned both, off of a bipod and rear bag I've got a couple of screamer groups from a 6.5mm Shilen that are largely unbelievable if they had not been witnessed.
Really, don't skimp on having someone competent install the barrel and you very likely won't be able to tell the difference.