From the Vault: WO 195-15442 – Resistance of armour to attack by HESH

The British have always had a bit of a thing for HESH ammunition.  Here is a British report from 1962 on the effectiveness of HESH projectiles against armor plate.  The basic jist of the report is that they found a wide difference in plate behavior when hit by a squash head (HESH) projectile.