Shot deer
40 Cal
Sorry about not responding a bit sooner, but in regard to your question, I am not entirely sure, but it may have been. I can't seem to find the reference to this particular event.
However, I did find another reference to another long range event with a weapon that would seem similar to a smooth bore fowler with a six foot barrel similar to some kind of chunk gun or wall gun. It has a pretty interesting story associated with it.
Here is the link to it:
https://allthingsliberty.com/2013/10/long-shot-september-1776/
That is interesting, and I would like to go there someday, check the island out, that is if a building don't sit on top of it