The current version of the T58 is a paper tank. The original design uses a separate loading ammunition. The shell was loaded by a auto loader in 2.6 seconds but the powder bags and cannon breech was all done manually. The current in game T58 is a T58E2 which was a design for a single shell with the 2.6 second reload making it a paper tank. T152 HESH shell explosive mass was not 15.9 kg but actually 11.8 kg. «
Accuracy and Armor Defeating Evaluation of Shell, HEP, 155mm, T152E5* (Ordnance Corps Project, 1957)» According to Hunnicutt’s “Firepower” , while the T57 had thick 5.38-inch (136.6mm) turret sides, the T58’s turret side armor was radically stripped down to a mere 3.25 to 2.75 inches (82.5mm to 69.8mm)