Reading this interesting thread I'm seriously doubting this is actually a cannon.
A stone soft enough to be drilled with a simple bow drill and such a small diameter hole, would likely be prone to explode with the smallest amount of gunpowder. On the other hand, a very hard stone such as granite or basalt, was almost impossible to be drilled like that.
This 'cannon' appears to be made of upper crust of limestone (Narry), which is a crunchy substance. The 'breech' area is narrower than the 'barrel', it should have been exactly the opposite. I believe it may be some kind of windlass or mechanical part from an antique industrial facility.
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