That is correct.
I spoke with a Rep at the SHOT Show and explained our desire for some hardened, plated, and buffered, #1 Buck in a Flight Control Wad.
He stated that there was simply not enough customer interest or demand for that product.
I told him, “How can there be “demand” if you don’t offer it?” 
He said, “Our product offerings are effected by what the military and law enforcement want, and they want 00 Buckshot.”
By the way, I had quite a long discussion with him about the FBI minimum penetration standards and why we want #1 Buck and he was very knoweldgable about the subject. He agreed with everything I said, but then just shrugged and said, “There isn’t enough demand.”
It’s not available because there isn’t enough demand, and there isn’t enough demand because it is unavailable. 