I use to be one of the guys that did it. we would guide duck hunts then after season we did electronic call hunts.The first hunt we ever did, 7 of us had 3 boxes of shells each and ran out an hour and half after shooting time. best hunt was 130 something. After 2 years the birds got real smart and it got hard to kill more 5 or 6 on a hunt. Way too much effort to kill those tundra maggots.