Im skeptical of the coating they are using IN the bore. Coatings have a limited life span under those kind of conditions and they are difficult to apply in a very uniform manner. Some are also very costly to apply. 416R stainless which is higher end rifle grade steel with something like Dynatek makes more sense and is probably cheaper.

Pacnor uses 416R stainless barrels and they shoot BH209 just fine.