I like this book. There is a lot of description and information aswell as some new rules for specific bullets and calibres.
My only concern is that it says that there are over 100 guns when in actual fact there are only 30ish there. What makes this 100 guns is actually varied statistics for the various calibres of the same gun. This does provide over 100 entries in a stats chart but I do find it a bit misleading as I only consider it to be 30ish guns. I guess its up to you how you wish to interpret the claim.