.458 Win Mag Barrel life???

I put 15,000 rounds through my McGowen .458 barrel. That tore the cartilage in my right shoulder, around 14,000, but NEVER GIVE UP!
I retired the barrel and sold it to a friend. It is still being used.
It was in perfect condition when sold, internally and still grouping at 1" or a bit better when using 350gr. Hornady or Speer bullets. Both are VERY accurate. I was only running those at 2,290fps.
I do not think you can wear one out in a single lifetime. Not many people shoot them as much as I did over the 30 years I shot it.
The bullets included cast, jacketed and bullets made from ctg. brass in weights to 550gr. and as light as my grouse load of a 230gr. Speer .452" pistol RN over 15gr. AL-8 + kapok fill for 1,340fps and 3" groups at 100 yards. I head shot 34 grouse and ptarmigan one fall near Smithers with that load.