DoubleD
In response to your question,

firstly an extra 108 pages the second edition has 180 pages this edition has 288 pages.

I will now quote from the Prologue of this book page 17.

"In this edition you will notice a lot more load data for full nitro double rifles . For this edition I have tried to shoot all the common cartridges and provide load information . The pressure test has once again been increased and each chapter revised to take account of the latest information available. The paradox chapter contrains some information on using the paradox in the hunting field ,both as a rifle and a shotgun."

I hope this helps

good shooting
sbs470