I believe that Point of Impact was Hunter's first sniping-oriented book. Entertaining, but how seriously can you take someone who has a central plot point hinge on the "fact" that at 1000 yards or whatever ridiculous distance, knowing windage was a piece of cake for the knowledgeable, but distance was just too difficult to really be a sure thing? And this for a guy who was lugging around a Wild or a Barr & Stroud, and had plotted out the location. Stephen Hunter is entertaining, and has put a lot of time into catching up for a firearm-deprived childhood, and is a genuine good guy, but John Ross he ain't.
Plaster for info.