I should probably note at the start that this book isn’t going to be for everyone. It’s a description of how a new 5.56mm round was developed, the design considerations, how they were met and the compromises that had to be made.
The impetus for the new round was a need to reduce or eliminate lead from small arms ammunition, to avoid falling foul of tightening state environmental regulations. During initial discussions, the issue of the existing M855 round’s performance came up, and so the program looked at improving performance in a number of areas, as well as reducing the environmental impact of the many rounds that were fired at ranges in the U.S. The end result was a round that was much improved over the existing round, at a similar cost.
The book describes the whole process, and the controversy that surrounded the new round, in a very readable manner. It’s not excessively long at a little over 5,000 words.