This textbook provides both the theoretical foundations and practical knowledge necessary for designing missile and artillery systems during the ballistic development stage. It covers essential information on propellants, solid fuels, and combustion laws. The book explores fundamental principles of gas dynamics and addresses applied problems related to the firing process, including mathematical modeling. It offers solutions to key challenges in internal and intermediate ballistics of artillery guns, as well as solid-fuel rocket engines. Additionally, the text emphasizes experimental ballistic methods, making it a comprehensive resource for engineers and students working in missile and artillery system design.