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[Ragingpantsless]

This idea is less of a cannon and more of a magma fertilizer.

[Urist Da Vinci]

As others have mentioned the magma likes to spread out. This wasn't a problem with my last magma trap.

I used 384 pumps, 4 on each of 94 levels, and 4000+ power to make a volcano in the middle of the map erupt. The map floods in no time at all.
Results:

Spoiler (click to show/hide)

This is a composite I made showing all the surface levels. Blur and darkness indicates depth.

A detailed explanation of it's workings.
A map from which the above image was created.

In my current fort, I am working on a device inspired by Vattic's Mechanical Volcano. I am currently halfway through draining 50z of volcano into the 3rd cavern, so I can build a similar pump stack. However, I intend to direct the output at the top into a piping network so I can cause an eruption anywhere. If I put primary outlets around the edge of the map, I could precisely kill sieges within seconds of them entering the map.