Heavy barrels are supposed to be less flexible increasing accuracy.
We need to understand how a stiffer barrel affects accuracy. When a round is fired a shockwave is set off traveling down the barrel making it vibrate at a certain frequency/amplitude. To simplify it think of it as a sine wave, though it is actually a very complex 3-D vibrational pattern. At a certain point in the cycle the barrel is "calm" and "looking" where you were aiming. We want the bullet to exit the muzzle at this point in the cycle and the load is said to be "in tune" with the rifle, best accuracy is seen.
All other factors being equal, there will be no difference in accuracy between a light and heavy barrel when they are shooting "in tune". The heavy barrel enjoys a lower amplitude of the shockwave and this is why I say it will be a little less ammo picky, at the extremes of the vibration cycle the barrel will be off target to a lesser degree than the lighter, "whippier" barrel. It will shoot ammo it "doesn't like" better than the lighter barrel.
The manufacture and finish of the Remington barrel though, I don't think is good enough to make a difference in heavy vs. light barrel. The quality of the interior finish of the bore is way more important for the overall accuracy potential. A poor finish will just never shoot consistently. An example of my 597 at 50 yards, it can be accurate but is not even close to consistent.
LSS standard barrel
With all those deep gouges in the bore, and several tight/loose spots in the barrel (felt when cleaning, inconsistent bore diameter) it's a small miracle some of those tight groups were shot. Overall it averages 0.6"-0.8" 5 shot groups at 50 yards with SK standard plus. It's plenty good for plinking, decide what you want based on aesthetics and what you wanna do with that $50. If the accuracy bug bites you, ya gotta get a better barrel than Remington or move to a nice bolt action platform.
