Why is a Tank that entered Service in 80s, using Shells from the

The Challenger Mk2 Entered Service in mid 80s. IT was fielded in the Gulf War, with L28A1, A DU round. Why is it stuck with 2 Variants of L23, a round developed for the CHIEFTAIN in the mid 70s? Its not like it would hurt to give the thing atleast L26/L26A1, So that it is competitive Pen wise with Russian and even other NATO tanks. You give the Russian tanks modern rounds that were created well after their variants were actually built. if the things armor is going to be made useless, atle

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