Colonel Jeff Cooper had a concept for an all-purpose carbine. From Wikipedia:
In the early 1980s, Cooper published an article describing his ideal of a general-purpose rifle, which he dubbed a Scout Rifle. This was a bolt-action carbine chambered in .30 caliber (7.62 mm), less than 1 meter in length, less than 3 kilograms in weight, with iron sights, a forward mounted optical sight, and fitted with a practical sling (such as Ching Sling). Cooper defined his goal: “… a general-purpose rifle is a conveniently portable, individually operated firearm, capable of striking a single decisive blow, on a live target of up to 200 kilos in weight, at any distance at which the operator can shoot with the precision necessary to place a shot in a vital area of the target.”
The Ruger Gunsite Scout Rifle is being marketed as, “the one rifle to have if you could have only one.” There is a lot of information on the gun available online (see here, and here). At seven pounds (without optic), it is very close to the roughly 6.6 pound ideal weight outlined by Colonel Cooper. It feeds from proven Accuracy International magazines (also produced by C Products). Street price for the gun is around $750. XS Sight Systems offers a rail extension that greatly increases rail estate and allows optics to be mounted above the receiver.