The support from the barrel is for accuracy-not weight. See-some manufacturers have pressure points in sporter weight barrels to make the harmonics uniform when the bullet travels down the bore. As the bullet travels down the bore, the barrel oscillates and whips due to vibrations the bullet causes. Having a pressure point in the forend pushes up on the barrel slightly and tends to dampen the vibrations in a uniform way, and is quicker/cheaper to manufacture than free floating the barrel. What I would recommend is to free float the barrel and upon testing for accuracy, if it don't group as it should will be easy to add a pressure point in the forend then if needed. Be sure to glass bed a couple inches of barrel just ahead of the action for good support. Hope this helped?
Sometimes you earthlings REALLY amaze me!