This paper presents some theoretical and practical aspects regarding finite element method applied in exterior ballistics. Using of this modern calculus method allows us to solve many aspects of exterior ballistics, specially geometric and cinematic characteristics of the projectile moving. One of the main problem in exterior ballistics is calculus of the aerodynamic drag force. This force can be easily calculated by FEM. Next to it the corrections due to atmosphere factors (wind, temperature) or firing from mobile platforms can also be easily calculated.