I'll assume that you're talking about practical accuracy, and in those terms, barrel quality, ammunition quality and the skill of the shooter will have much more of an impact on accuracy than the barrel length. Even with a 14.5" barrel, you can hit a man sized target at 300 yards with iron sights relatively easily. If you're looking to shoot ground hogs at 400 yards, then you want something more along the lines of a 20" varmint barrel and a high powered (10x or so) optic. If what you want is an all round sort of rifle, I'd be tempted to recommend something with a 20" govt or lightweight profile barrel, and a low powered variable (i.e. 1-4x or 1.5-6x) optic.