My favorite is still Waters' and Roberts' "The Breech Loading Single Shot Rifle." Years ago I found a first ed. which Ken was kind enough to sign for me at the diner in his hometown later. I miss him and "Pet Loads." But I still get a kick out of Steven Bodio's "Good Guns" and have lost a few because I always loan it to people who are "thinking of getting into guns, or shooting, or hunting."
Keith was a blowhard, but his experience is still valuable and interesting (one blowhard to another, my wife would say....).
I'll buy and read any gun book I can afford but I now keep very few, mostly single shot rifle books. Unfortunately word has got around that gun books are valuable, so they are pricey in almost any book store. I find the few I can afford at library book sales, estate sales, thrift shops, garage sales, etc. Most I read and then resell on online gun boards like this one (but I haven't found any recently good enough to offer here....I'll save "the best for the best.").
Wish I could afford the series on English Single Shot Rifles but over the years I have found a grand total of one volume for sale at a price I could afford. Three whole dollars at a "Friends of the Library" sale in Mesa Verde, CA! Mint with dust jacket and all.
Gary D., public librarians tell me that gun books are the "most stolen" of any category of library book. Add to that the political correctness problem and tiny budgets and there just aren't many gun books in libraries any more. And what few there are are usually in the non-circulating "reference" section....not a way to culture a new generation of riflemen and women!