Well, what is the reasonable lifetime of a barrel chambered in Accuracy International 6.5 x 47?
I don't have one. I did look up the 6.5 X 47 Lapua
http://www.accurateshooter.com/featured/65x47/ and it seems to be a pretty high pressure round:
High pressure capacity (435 MPa / 63090 psi) and efficient case design yields excellent velocities along with excellent brass life.
I will bet, the handloads of long range shooters are closer to 70,000 psia than 63,000.
I do have buds who were shooting things like 6.5 X 284, 260 Rem, and one, was shooting a 243 Winchester. The 243 Winchester was shot out between 700 and 800 rounds. The guys with the 6.5's, if memory serves right, those barrels were toast around 1200 to 1400 rounds.
I am of the opinion that anyone getting 2000 rounds out of a 6.5 X 47 anything, was doing real good. And I also believe, the bore cleaner was not at fault. We will see if the bore cleaner was at fault. If this guy rebarrels with the same cartridge and never uses brake cleaner again, and has to replace the next barrel around 1500 rounds, we will know his problem is all about the cartridge. And I will bet, we won't hear any yelping about brake cleaner, in fact, we won't hear any yelping at all.