What's often generalized, to outright missed in discussion, is the qualifiers.
There ALWAYS are..
There are atleast three directly related to barrel life:
1. How you define barrel death
2. The rate of fire
3. The heat, duration of it, and pressure, released on a given area, with each shot
With this in an extreme, you could wipe out(for use by some) a 223, in under 1,000rds.
It is very possible, and I've seen it at my range. I've seen red hot smoking barrels, with bits of rifling dropping out of flash hider holes.
I picked up a piece and talked to a shooter who thought like many so far. But his gun still served it's purpose(assault), and that's qualifier #1.