Sierra’s Infinity Exterior Ballistic Computer Software version 6 provides multiple trajectory charts and graphics, point blank range, calculate zero, uphill/downhill shooting, maximum range, minute of angle, profiled wind, improved atmospherics, revised print formats trajectory in mils and more. Easy to use Windows format makes Infinity extremely user friendly. Bullet library includes all major bullet companies as well as ammunition companies and allows for addition of new and custom bullets. Renowned Sierra Ballistic Consultants Ted Almgren and Dr. Bill McDonald, who have written all Sierra Software since 1970, also wrote Infinity. Both are retired Chief Scientists from a major aerospace company. Integrated into the Exterior Ballistic program is the entire Sierra 5th Edition Rifle and Handgun Reloading Data manual. This program is available in CD-Rom format only. System requirements are: Windows 7, Vista or XP, 800x600 resolution (1024x768 recommended), IE 6 or higher, Dot Net Framework 2.0 or higher (included in install), 60MB hard drive space.