Tim Mullin said his custom 7.5 lb .308 was not enough less accurate than a 15 lb name brand military sniper rifle to bother him. Give up a small fraction of a MOA for half the weight to hump? You bet. I do not understand why military sniper rifles are so heavy.
I think the heavy FACTORY barrel might be a better shooter than a light profile, because the added metal MIGHT counteract some of its mass production dimensions, hasty stress relief (if any) and quick fit to action.
E200 better? I don't know.