In all the replies I see only one mention of Charles Askins (Jr.) Myabe that is because others think like me and I place him on the very top of the "unlikeable" writers. Arrogant, pompus, know-it-all, plus highly critical of good writers.
Jim Carmichael had it really hard, taking over from Jack O'Connor, but he certainly knows firearms and is a good writer.
No one has mentioned our two west coast Canadian writers, Lee Straight and Mike Cramond. Lee was primarily a salmon fisherman, but did lots of rifle shooting and expirementing, as well. Mike Cramond was sort of always in Lee's shadow, but has written some good books on western Canadian hunting.
One can sertainly learn a lot about firearms from Julian Hatcher's famous book, "Hatcher's Notebook."
I have two good pistol books by Nonte. I have Jack O'Connor's, Rifle and Shotgun Book, his Shotgun Book, but darn, don't have his one on rifles only.
My most unique book has to be my favorite. "Camp Life and the Tricks of Trapping," by W. Hamilton Gibson. Here is what is stated on an opening page.
"Entered according to Act of Congress, in the year 1881, W. Hamilton Gibson,
In the Office of the Librarian of Congress, at Washington." all rights reserved.
It even has sections on hunting buffalo!