Thanks for the interesting article Ray.
Two things being argued on this thread are adressed in the article.
First, the author states that yes, the Barnes X penetrates more, but with a small wound channel. (no free lunch).
Second, with all lead core bullets, the higher the velocity, the bigger the wound, but the less the penetration. He states that the .308 Winchester out-penetrated the .300 Weatherby. Imagine that!