Philip P. Massaro is the founder and president of Massaro Ballistic Laboratories, which creates custom handloaded ammunition. In addition to his ballistics work, Massaro is the author of Gun Digest Shooters Guide to Reloading, Handloader's Digest, and Understanding Ballistics: Complete Guide to Bullet Selection. He is a contributor to Cartridges of the World, 15th Edition, and Gun Digest the Magazine. Massaro lives in upstate New York.