New assault rifle for some units of the british army

[CINDERS]

7.62X51 with two gas settings,

In this case jim they have the training round in a one piece brass case loaded down to a useable pressure, that conflict round @80K CUP in my mind would make it a hot rod and a barrel burner.
So unless they are using chrome lined barrels one feels throat and muzzle wear will be an issue.