About L55 gun , length is not important, function is important.
US m829 a1 depleted uranium sabot can waste any armour.
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What are the DU Shells?
DU shells are called armor-piercing firebombs, because they not only
break through a steel armor but also burn up intensely. As armor-piercing
rounds, they would punch out the bulky iron plate of tanks, invade their
interior, and bounce around inside killing the combat crew, destroying
tank facilities and burn them out. They would hit the target with their
enormous momentum and pierce a hole with their kinetic energy..
Compared to steel bullets of the same size, which have less density than
DU rounds, the latter can make a hole in the target 2.4 times deeper than
the former. And, while steel bullets must have the length of 30 cm, DU
bullets only have to be 12 cm to suite their purpose. Further, when fired,
although DU shells receive the same air resistance as steel ones, they
have less reduction of speed because they are 2.4 times heavier, which
gives them longer range and bigger velocity in impacting the target.
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Should we buy Ukranian nuclear waste from nuclear plants?