I have a 7MM Mag caliber Winchester Model 70, stainless with synthetic stock and it is the most accurate out of the box rifle I have ever shoot or owned. Bought it around 1982. It appears the "adjustable" Boss is no longer made or available. That is a shame. I have experimented with this "adjustable boss" for many many bench rest rounds. It adjust the barrel harmonics to match the loads: factory or reloads, and it works miraculously. What happened to it? Average hunter can make it a tack driver out to 3-400 yards with factory ammo. I just do not understand where it disappeared to.