Punts are used out in the Fens (or Norfolk, or somewhere) for wildfowl shooting, IIRC. And punt-guns tend to be huge, like 4-bore or so.

And on the Broads, I've had to quant a yacht - like punting, but for a full-size boat; you can walk along the deck as you push. Bloody hard work, as I recall (not that I do recall a great deal, due to lack of ebriation).