Lucky Gunnar did a huge test on this. Four test rifles with Federal, Wolf, Tula, Brown Bear.
The steel cased/bimetal jacketed ammunition caused accelerated wear to the barrel. The barrel that shot the brass case FMJ had plenty of life left, even after 10,000 rounds at extremely high rates of fire, the Wolf/Brown Bear, Tula barrels were subjected to the same rates of fire and were completely shot out by 6,000 rounds. Also, the chrome lining of the bimetal test AR was almost gone from the throat forward. Throat erosion was pretty bad as well. Pretty much smoothbores.
Yes saving money on the ammo will offset the cost of the barrel. But people need to make an informed decision buying this stuff. I would only run this through a beater AR rather than a KAC or Noveske.