Copper queen

[Blacktail1]

Hey folks just curious what your experience with benchmark barrels has been. I recently had a rem 700 chambered in 257 Roy with a 26” benchmark barrel. This thing is giving me fits with copper fouling. I’m shoot 100 grain partitions out of it . I can shoot five 3 shot strings before it opens up and is fouled . I clean it with wipe out until the blue stops . I’m hoping it breaks in soon but I’m 50 rounds in now with no change. What had your experience been with benchmark barrels and copper ? Thanks. BT1