As far as out of the box factory actions go, I readily admit that both the Winchester 70 and the Remington 700 factory actions are surpassed by the Sauer 100/Mauser M18 factory action. It is just better. It is one of many newly designed actions, with the difference being that it is actually an improvement.
Guns&Ammo:
One improvement is the breach sleeve.
Breech rings are an emerging trend in bolt-action rifles and their popularity will only increase because the advantages they offer both shooter and manufacturer are too compelling to ignore. Let me explain.
Traditional bolt-action manufacturing takes a large cylindrical piece of steel and cuts the lug abutments into the front of it (internally). Once the barrel is threaded into place, the bolt lugs sit on the abutments to lock the action closed so the rifle can safely fire. Because the action is so large, there are wide variations on where those lug abutments actually wind up. Actions made this way need someone trained in headspacing a rifle to get the barrel in the right position.
A breech ring is a small part that uses very rigid tooling, so each one is identical (usually to within .0005 inch). Once the breech ring is inside the receiver, the barrel can just be screwed into the receiver until it touches the breech ring and headspace will be correct. The front of the breech ring gives the barrel a known stopping point in relation to the lug abutments to ensure headpsace is the same every time. No hand fitting is necessary.
The savings on assembly time and reduced scrap rate guarantee breech rings will be the future of bolt-action rifles.
Breech rings represent a more sophisticated form of manufacturing that is a tad more expensive, but the savings on assembly time and reduced scrap rate guarantee breech rings will be the future of bolt-action rifles. Sauer is the first one to do it on their budget rifle.