The investigation of factors influencing the ballistic effectiveness of body armor is crucial to the development of reliable body armor able to protect wearers against armor-piercing projectiles. Numerical simulation plays a key role in this endeavor. This study focuses specifically on evaluating the ballistic performance of hard body armor consisting of ceramic composite plates versus an ogival-nosed projectile. The study aims to discern the effect of the impact velocity and the oblique angle of the projectile on the residual velocity and the target damage to help us choose the appropriate bullet-proof vest architecture. The results showed that the impact velocity has a considerable influence on the target damage. Moreover, it is revealed that the residual velocity and the target damage are sensitive to the oblique angle. Increasing the oblique angle increases the residual velocity and decreases the target damage and deformation.