Everything HESH can do multi-fusing HE can do better. And is probably cheaper to make.
Which makes HESH obsolete.
Again, im not disagreeing. Where im disagreeing is that the funds to rerole to a vehicle with HE shells and much else is not there for us to spend. Is it worth the extra outlay to get it? Probably not, unless we go the whole hog and replace the turret.
It would have been a lot smarter back in 1989 to not go with a rifled gun. But there was a lot of good reasons why we should not least we had a tank park of over a thousand tanks back then.
HE-Frag rounds were, and still are, cheaper to manufacture than HESH rounds. Also, 120mm spin-stabilized HE-Frag shells would most likely be more effective than fin-stabilized HE-Frag shells since they don't have the added drag of the fins and don't need to carry the extra 1-2 kg of aluminium at the back which doesn't contribute significantly as fragmentation.
Probably even an adapted 120 mm mortar shell albeit with a reduced load would suffice. But then a HE-FRAG or HE-PFF are rather simple projectiles and that is the type of ammuniton mostly going tpo be used the most when doing colonial expeditions to Iraq or Afghanistan or whereever else. So a production run is viable. Maybe they can even get Jordania for a group buy. For fighting the derkaderkas they have a use for such a round as well.
Concerning the use of the L30 - compatibility with the older L11 was a good reason to keep a rifled gun, yes, but compatibility with the rest of NATO was an even better reason to NOT keep a rifled gun.
The decision was made, when there were more like hundreds to a thousand Challengers planned plus expectations of exports as was the case with Chieftain. Then the Cold War ended and Whitehall had nothing better to do than cutting up the Challenger fleet as fast as possible. If the ammuniton situation had been better and more users, Greece might have gone with the CR2 as they seemed to be quite liking the vehicle for their requirements. but that was already when the UK MoD had painted itself into a corner in a dead end.
edited to add: when adopted the L30 performed easily on par with the Rh120 cannon, the RTR could keep its training pretty much the same. So imho it was a quite reasonable decision back then.
Edited by Panzermann, 01 August 2019 - 1133 AM.