Another thing to think about is if you'll ever hunt in a area that is lead free. A 300 win mag offers more and heavier grain options in lead free than 7mm. This is just my opinion but a light rifle I think is subject to what caliber its in. Weight has a big factor in recoil as people have pointed out which affects accuracy. A 243 that has a finished weight of 5 and a 1/2 pounds I would consider light and you could still shoot it accurately but maybe not as consistently as one that weighs 8 pounds. A 7 pound 300 win mag is light and can be shot accurately but maybe not as consistent as a 9 pound one. Another consideration is where the weigh savings is coming from. Calibers with a lot of recoil need a strong stock and if the particular rifle you buy saves weigh in the stock that could affect durability in the long run. They could also save weight by using a lighter barrel contour which is going to be less accurate because it isn't as stiff and could burn out quicker if your shooting a fast load through it. They could also use shorter barrels which is going to increase accuracy because it'll be stiffer but will lower your velocity and energy down range. All in all its up to you and everybody looks for something a little different. I have a 300 win mag that weighs 8.5 pounds and want something slightly heavier. The way I look at it is if I add a pound to my rifle I can lose a pound off my body and the total weight I'm carrying all day is the same.