SIMP is exactly right regarding heat if you are shooting alot.

Myself, I prefer a heavy barrelbecause of the style of hunting I do, but if you are going to do a lot of walking or have to carry the gun alot then the standard sporter barrel is the better choice. The extra couple of pounds for the heavy barrel really make a big difference when you have to carry your gun alot.

As far as accuracy is concerned...out in the field in the application I mentioned above, the difference is negligable. A heavy barrel makes a difference when shooting on a bench but out in the field you don't have the luxury to shoot off of sandbags. Might as well have something you can carry more comfortably.