IMHO, barrels have come a long way over the past twenty years.
But not that far.
I guess it depends on the venues you're shooting?
When I was still shooting competitively, once a 308 Win barrel had the first hundred rounds down the bore, it was time to change seating depth a few thou.
Then, keep a diary of round count and accuracy, when the groups started to open up, even slightly, it was time to change seating depth again, then continue doing this until it wasn't working. If push came to shove anywhere between 1500 and 2500 rounds.
The life could be extended, especially on a really good, consistent barrel by cutting off the tenon, recutting the threads/shoulder and rechambering to take out the worn leade and rifling immediately afterward. This works most of the time, but not always.
I don't remember ever getting 5000 rounds out of any barrel I had, no matter how good or who made it.
The best barrel I ever had, lasted just under 4000 rounds and it was made by Lilja. Hart barrels were next for longevity.