For my buddy that guides for sheep the difference is usually whether he ends up carrying the clients rifle or not! lolweight between a crazy light rifle and heavy is usually just a couple days of food.
I didn’t put anything together… bought it from Weatherby and with that six lbs rifle/scope I can put three in a row in a 6” target at 600 yards from a cold barrel. That’s two more bullets than I usually need to kill an animal.Thin barrels and small scopes definitely appear to be the way to save weight. Pretty tough to put a light weight rifle together that you can take to the range and shoot without melting the barrel.