I read the other day that the 220 Swift would pretty much wear the barrel out in about 2000 rounds (at normal velocity).
Negatory.
Search these forums. The Swift's "barrel burning" tendencies have been beaten to death. (Along with other cartridges.)
The consensus is always the same: A properly cared-for rifle will yield many thousands of rounds before erosion is considered any kind of issue. There are quite a few of us Swift shooters on these forums, that have up to 5,000-10,000 rounds down the pipe... with no noticeable throat erosion.
My Swift came from my dad. He put several thousand rounds through it, before I put about 500 through it. He was a speed freak, always seeking 4,400-4,500 fps with 52gr bullets. He ruptured more cases, and blew more primers than I can remember. Yet... the rifle is just fine.
Case shape, velocity (powder charge), powder choice (granule shape and burn rate), and bore size can be linked together to show why some rifles show erosion faster than others - but, not all.
Most rifles labeled with "burned barrels" were subjected to insane pressure (over max), high velocity, way-too-light projectiles, and poor powder choices for extended periods of time. ...Or, were fired continuously for several hundred rounds, with no cool down for the barrel.
Those that seek the 5,000 fps mark are those that own barrel burners.
The rest of us own normal rifles.