It doesn't burn the barrel so much as it burns the throat of the barrel. Expect about 1500 - 1800+ rounds through it before it is a bit too sloppy. Barrels in long range shooting are expendable. I use Kreiger or Bartlein barrels. My 300 WM got 1130 or so rounds through it before it was not good enough for long range target.
Next barrel I'm considering to Melonite it. Melonite process hardens a few micron thick layer surface of barrel to about the equilivant to rockwell hardness of 70. Some, in the 300 WM caliber, claim they see wear at 3000 rounds that looks like 500 rounds.
Heres a little info. on the Melonite process and what it does.
Melonite Surface Treatment for Barrels, Bolts, and Actions « Daily Bulletin