Penguin
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BalonyL30A1 120 mm rifled gun is not as impressive as 120 mm Smoothbore gun of Abrams or Leo2.
Its HESH rounds have a longer range (up to 8 kilometres or 5 miles) than APFSDS, and are more effective against buildings and thin-skinned vehicles. It also fires APFSDS.
Challenger 2 - Wikipedia, the free encyclopediaThe Challenger Lethality Improvement Programme (CLIP) was a programme to replace the current L30A1 rifled gun with the 120 mm Rheinmetal L55 smoothbore gun currently used in theLeopard 2A6. The use of a smoothbore weapon would have allowed Challenger 2 to use NATO standard ammunition developed in Germany and the US. This includes tungsten-based kinetic energy penetrators , which do not have the same political and environmental objections as depleted uranium rounds. The production lines for rifled 120 mm ammunition in the UK have been closed for some years, so existing stocks of ammunition for the L30A1 are finite. In 2009, a new HESH round manufactured in Belgium has been trialled. This means that the Challenger 2 now has available a new Tungsten FIN and HESH rounds, if and when required, which secures a line of ammunition for its calibre Length 55 rifled main gun, the L30, when required in the future.
A single Challenger 2 was fitted with the L55 and underwent trials in January 2006. The smoothbore gun is the same length as the L30A1, and is fitted with the rifled gun's cradle, thermal sleeve, bore evacuator and muzzle reference system. Early trials apparently revealed that the German tungsten DM53 round was more effective than the depleted uranium CHARM 3. The ammunition storage and handling arrangements will need to be changed to cater for the single-piece smoothbore rounds, instead of the separate-loading rifled rounds. In 2006, a figure of £386 million was estimated to fit all Challengers in the British Army with the Rheinmetall gun
That is, UK preference is guided by political sensitivity and logistics rather than performance of the 120mm rifled gun per se.....
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