For typical hunting, varmint and match bullets shot to conventional distances, traditional Ballistic Coefficient (BC) based ballistic calculators are perfectly adequate for calculating trajectory. The Hornady 4DOF calculator separates itself from BC based calculators when shooting at extended range with what Hornady considers truly match accurate, low-drag style projectiles with a G1 BC over .500, including Hornady ELD-X, ELD Match and Hornady BTHP Match bullets, as well as certain competitors' products.
There is a considerable amount of time invested in data collection for any one bullet. Thus, in order to be considered for Doppler radar testing and inclusion in the Hornady 4DOF database, bullets must have either Heat Shield or finished metal tips (BTHP), be truly match accurate, and have a G1 BC over .500. When considering a hunting bullet, it must exhibit excellent terminal performance at both conventional and extended ranges. Bullets that don't meet all these prerequisites won’t be included in the Hornady 4DOF library.