My Kimber 84M in 308 weighs 5 lbs 2oz. With a Leupold 2.5-8X scope in Talley Lightweights it weighs 5 lbs 15 oz. Shoots most 3 shot groups under 1". Most lightweights take the weight from the barrel by making it thinner,(Weatherby and Remington Mt rifle), or shorter, (Remington 7). The Weatherby action is the heaviest of all actions and they use a fairly heavy stock. Remington's actions are pretty light, especially the Ti actions, but they too use a heavy stock.
The Kimber uses a trimmer action designed to be as light weight as possible and a lightweight 18 oz stock. They keep some weight and length in the barrel where it needs to be for accuracy and proper balance.
If you want to spend less money a Tikka is a lot cheaper and only about a pound heavier.
Savage rifles used to be fairly lightweight, but since changing to steel bottom metal recently they have put on weight and are now heavy and are have increased in price to the point that they are no longer a bargain.
Howa's are excellent rifles,but at nearly 8 lbs hardly lightweight.