Just to put this into perspective, there are probably < 20 active punt gunners in the UK today, and far from shooting "hundreds of sitting waterfowl", the most successful shot in a season - and it may be one of the very few - could be a handful of duck if you are lucky. The average punt-gunner does not get a chance to be out much given conditions are often not right, and the skill involved in approaching a highly cautious and wary quarry are very significant indeed, especially on a strong tide. I doubt any punt-gunner nowadays shoot even close to the number of wildfowl an average shoulder-gunner does, especially one shooting over decoys from a blind.
Read "Morning Flight" by Peter Scott to get a sense as to punt-gunning, although remember this was over 80 yrs ago and there are no where near the same number practicing this skill any longer.
