Pretty much THE standard firearms reference text. For the beginner the task of choosing and recognising a cartridge can be a tad confusing at best ( A simple example will suffice- this round is a .22 rimfire. Is it a .22 short? a .22 Long? A .22 Long rifle? a .22 shot cartridge? a 5mm rem. Magnum? a .22 Win. Mag?- you get the idea. Lets not even start on .30 Cal. Magnums!)
This is the authortive guidelines on every cartridge ever produced, with short history, ballistics and so on. Handloaders, and collectors must have this- hunters might manage to live without.
There are some opinions scattered throughout the book, but nothing in those is particully worrying- there is certainly no opinion that I would consider dangerous or worrying. And even if there are opinions which you might disagree with, gentle reader, this is still the only book that I am aware of that goes into such depth on such a range of cartridges. Recommended.