HESH rounds are a high explosive round encased in a thin outer shell with a soft plastic tip and a delayed- action fuse in the base. Their armour-piercing capabilities are somewhat limited and they are used mainly against soft targets, lightly armoured vehicles and buildings. High-Explosive rounds (HE) as distinct from High-Explosive Armour Piercing rounds rely more on blast and are usually detonated on impact or with a timed or chemical fuse. They are generally used against tank armour, concrete or other defences, depending on the calibre of the round being used.Īrmour piecing rounds contain no explosive instead they rely solely on the massive amount of kinetic energy delivered by the explosive propellant and gun barrel design, to penetrate the armour. Generally the round is made from special, high chromium steel which is forged into shape, rather than cast, and then annealed this imparts extremely high tensile strength into the round. The Armour-piecing round must be able to withstand the shock wave of punching through armoured plate without disintegrating, to enable the shell to archive this, a greatly strengthened case with a specially hardened and shaped nose had to be developed. At the end of the First World War the army started using armour-piecing rounds for Anti-tank operations.
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