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As per the title really. I’m looking for ammo that looks like it would fit in an Earthshaker cannon, heavy mortar and other artillery.

Can anybody point me in the right direction? There must be a third party that produces them somewhere!

https://victoriaminiatures.com/collections/artillery
Towards the bottom of the page.
Also Anvil:
https://www.anvilindustry.co.uk/artillery-shells-pack
Pretty sure there's another I forgot, but that'd give you a start.

Buy spent casings on ebay, there was a great pretorian display in my old GW store that had 9mm ammunition.

152mm 1/35 scale models

https://miniart-models.com/de/products/35076/

Thanks for the info folks.