My experience both jump shooting over fresh water or shooting eiders and scoters in the salt was as follows:
Generally in the early part of the duck season when the ducks plumage is still fairly light we jump shot with #6 shot and same in the salt over 30 to 75 decoys as the shooting was close in.
As the duck season in our part of the north east, (plymouth, mass.) wore on and the ducks plumage got heavier due to increasing cold weather, we switched to heavier #4 shot.
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