Re: heavy vs standard barrels
If it's a target gun application- and you plan on sending a lot of lead downrange, a heavy barrel is often the best choice...although my son has a Savage .308 Hunter in a Choate stock that he uses for target. Sends 100 rounds downrange in a day's shooting (600-1000) and he does just fine with it...
Heavy barrels don't "whip" as much as factory contours, and don't change harmonics as much when they heat up from more rapid fire.
For a hunting rifle, where the cold bore shot is what counts- and you want lightweight to carry, factory contours are usually preferred.
Do a search, much discussion on "barrel harmonics"...
But like I said, IF this is a target gun, and IF you can cancel and change to a varmint or bull contour barrel, I'd do it.
Distance has nothing to do with it. Accuracy, is accuracy, at any distance.