This final paper describes in detail the deflection of the 2A46 tank gun barrel due to ballistic and meteorological conditions. The analysis includes different types of ammunition and a certain way and how certain ballistic and meteorological conditions affect the deflection of the tank gun barrel in horizontal and vertical planes. Firstly, the historical development of tank guns is described briefly, then the parts of the barrel will be listed and their role explained, especially its thermal shroud. In order to understand the concept of barrel deflection, prior to more detailed analysis, the behavior of high-strength steels under elevated temperature conditions is explained. By analyzing the deflection, the reader is acquainted with the behavior of the barrel during the firing process and parameters which significantly affect the barrel’s deflection of the target, as well as the general direction of barrel movement after projectile is fired (under operating conditions). Lastly, barrel wear mechanisms are described and techniques to decrease it given.