Palliser Shell
Britain also deployed Palliser shells in the 1870s-1880s. In the shell the cavity was slightly larger than in the shot and was filled with gunpowder instead of being empty, to provide a small explosive effect after penetrating armour plating. The shell was correspondingly slightly longer than the shot to compensate for the lighter cavity. The powder filling was ignited by the shock of impact and hence did not require a fuze. While these Palliser shells were effective against unhardened iron, British doctrine held that only shot (i.e. non-explosive projectiles) were suitable for penetrating the new hardened armour being developed in the 1880s; hence the gunpowder filling was discontinued.
Read more about this topic: Palliser Shot And Shell
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