Röchling shells were bunker-busting artillery shells, developed by German engineer August Cönders during World War II, based on the theory of increasing the sectional density to improve penetration. == Description == The subcaliber shells made from chrome-vanadium steel were able to penetrate much more than 4 metres (13 ft) of reinforced concrete roof before burying the shell through the floor and into earth.
Röchling shells were bunker-busting artillery shells, developed by German engineer August Cönders during World War II, based on the theory of increasing the sectional density to improve penetration. == Description == The subcaliber shells made from chrome-vanadium steel were able to penetrate much more than 4 metres (13 ft) of reinforced concrete roof before burying the shell through the floor and into earth.
Source: Wikipedia "Röchling shell" · CC BY-SA 4.0
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