 This is due to the large size of the mortar and the weight of its ammunition ( for a standard HE rounds and rocket-assisted HE rounds).It can also be loaded one round at a time via a small crane, which is most often used to load the magazines or to place specialty rounds onto the loading track.The 2S4 has a range of 9,650 meters using standard high-explosive rounds, but a range of 20,000 meters using extended range munition.