The results of the design and simulation of the railgun with pulsed-dynamic biasing of the muzzle (PDB). Principles of operation of the railgun system with PDB, simulation carried out computer simulations were studied. Based on the results of simulation have been proposed three basic variants of the structural performance of the railgun system with PDB. The results of preliminary calculations showed efficiency of the proposed ideas, the availability of application design and feasibility of their implementation. Subsequent experimental verification confirmed the correctness of a model and a satisfactory agreement with calculated data.