That is an absolute cannon.

I could just see it now, BOOM and the boat goes shooting into the lake ass backwards.

specifically, mounted on a punt

YOUR WHAT?

WHAAAAATT????

WHY IS EVERYONE ALL CAPS??

BOOKS ARE BECKONING, YOU SAY?

"Broke into the wrong gul dern recroom, you big jerk"

I can't unhear the silly USA network censoring after having watched so many times.

Also low-flying aircraft.

And somehow massive fishing nets still allowed.

Here's a song about what these guns accomplished.

For the best, but I can't say I'm not morbidly curious as to what the result of one of these monsters would look like. A flurry of feathers and falling bird corpses, I would expect.

decimate bird populations

decimation then:

In the military of ancient Rome, decimation (from Latin decimatio 'removal of a tenth'[1]) was a form of military discipline in which every tenth man in a group was executed by members of his cohort.

and now:

The word decimation in English is often used to refer to an extreme reduction in the number of a population or force or an overall sense of destruction and ruin.

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