gunzo,
Maybe a decade ago I decided to test a bunch of Keith's loads, as closely as I could reproduce them as possible in a variety of handguns and rifles--then published an article about the experiment. Basically, they all worked VERY well, which is one reason I tend to believe what he wrote.
But the other reason I tend to believe what he wrote is I've met a number of people who knew Keith, and said he did not BS. He had his biases, for sure, but we all do.