you did not make clear if the books were to be about hunting or techical books about rifle performance.
I think as far as performance a real classic is the book by the late Warren Page of Field and Stream magazine called "The Accurate Rifle". Page was a pinoeer in bench rest shooting and when he started writing for Field And Steam believe it or not he knew nothing about rifles. He went on to design the .243 winchester and also to popularize the 7mm Mashburn magnum whoes idea was naturally stolen by a gun company (Remington) and brought out as the 7mm Remington Magnum
Although Page was never a rich man he often took some fantasic world wide hunts being once offered 100 sheep and two wives for a trade for his 7mm Mashburn magnum. Me, I would have taken the trade but Page realized the local chieftan in Afganistan would not have been able to find any custom ammo for the hand built 98 Mauser rifle and being that he already had a wife he declined the offer.
Although Page is not as well known today as the loud mouth braggert Keith( who took credit for much of what he never invented) or Jack O'conner( who was a great hunting writer but understood little about the mechanics of super accuracy or bench rest shooting ) Page was one of the great gun editiors of this last century.
If you want a super book about hunting with rifles that took place back in the mid 1800's get the great books by Samuel Baker. His book "The Rifle and the Hound in Ceylon" is one of the all time great hunting books or his books on hunting and fighting in Africa or hunting in America are also great classics.
Another great book to end all African Hunting books is "Hunter" by John Hunter. Hunter like two things, beautiful rifles and beautiful exotic women . His book is perhaps the best hunting and romance book ever written about Africa. Many men would not even hire hunter as a guide because of his reputation of stealing the hearts of other mens wives.
Another not to miss book is Jim Corbets book's on Hunting the Man Eating Tigers of India. One of them is "The Man Eating Tigers of Kumaon." No other books ever written about India or tiger hunting ever even come close to Jim Corbets books. His books will keep you on the edge of your seat and your heart will be in your mouth. I cannot recommend this book more highly. It is the classsic of all classics.
And do not forget the other great African authors like W.D.M. Bell, Peter Newman, Donald Sutherland, Major Foran, John Taylor, John Boyes, Tippo Tibb, Grogan etc. ---------------------------------------- All these stories can be found in a short form in another book written by John Hunter and Daniel P Mannix called "Tales of the African Frontier" Another great book you will not be able to put down. Dont miss it.