Re: Tank Sizes

The Germans  in the Second World War designed an anti tank gun where the

propellant was ignited in a separate chamber. Gases leaked into the main

chamber behind the round that was secured by a pin. When the pressure
reach 
a certain point the pin broke and the round was fired. This enabled a
gun 
with a much lighter breech and barrel to be used because it wasn't
having to 
put up with a powerful explosion.

Buck
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