[oh8eleven]

The book that may be similar has the author teaching Ruby and Oswald how to shoot.
Oswald learned how to shoot in the Marine Corps. No one does it better.

[Durus]

Military records indicate that Oswald was not a talented marksman, in fact he did quite poorly using a far superior rifle (m1 garand) to that of the carcano he is purported to have used during the assassination.