Ever since reading this book I've not been able to look at my "springer" in the same way. If you thought that air compressed by the spring is the only thing that gives the pellet its muzzle energy then you, like I was, are wrong.
If you want to understand your spring powered air rifle, find out the importance of lubrication, understand the unique recoil of a springer and why they can eat scopes alive you must get this book.
This book contains so many gems it's hard to know where to start. A little bit technical.