Firstly, there is not such thing as a "simple" large calibre round. Even the "relatively simple" AP rounds, such as the solid slugs commonly used in WWII era tanks, require precision engineering. It's far simplier to say as a GM that these rounds cannot be reloaded (and IRL the vast majority can't anyway) and production of them is only possible in prewar facilities.
With regard to dies and production machinery, anyone with half a brain would quickly see the value of them, although if the pressure was on and time limited, they're not much good short term.
The machinery using the dies, etc are just as valuable and so I can see large scale offensives (at least large in terms of T2K forces) to capture and hold these types of facilities.
Something that should be kept in mind too is that just because a factory produces 120mm smoothbore tank rounds, it's very unlikely to be set up to produce 120mm mortar or artillery rounds, let alone rockets and missiles.
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