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If it's the shells I'm thinking of the copper is disk with a shaped charge behind it. When the shaped charge detonates the copper disk forms a pencil-sized jet of motlen metal that burns through armor. The DU, along with the explosive gasses, burns up as it goes through the hole and, basically explodes inside and burns up anything and anyone unlucky enough to be inside.
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USAF Retired 
Far better is it to dare mighty things, to win glorius triumphs, even though checkered by failure... than to rank with those poor spirits who neither enjoy nor suffer much, because they live in a gray twilight that knows not victory nor defeat.
Theodore Roosevelt
Don't sweat the petty things and don't pet the sweaty things
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