A finite element model is developed in Abaqus Explicit to determine the resistance of Salem Limestone with three levels of initial micro-cracking to high-speed, monotonic impact. A comprehensive description of the model development is included, and the model is validated by comparing simulation impact results to known penetration depths during a mesh refinement study. The uniaxial compression simulations were performed to correlate the HJC damage parameter to the uniaxial compressive strengths from mechanical test data. Then, the HJC damage parameter is compared to the unconfined compression strengths to correlate the micro-crack damage levels. Subsequently, the model was used to determine the correlation of the penetration depths at the finite damage levels. In conclusion, the model described in the paper can adequately predict the penetration depths of the projectiles for a range of micro-crack damage levels. The micro-cracking did/did not affect the penetration depth.