When it comes to "Facts" about a shotgun I'll take Burrard hands down over any other I have ever read. His writing was not what you would call "Entertaining" but with a desire to learn about shotguns I never found it "Boring". A lot depends upon one's purpose for reading to begin with.
Most Technical books are not per se entertaining, but they are where you gain knowledge.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra