I've been jump shooting ducks from a purpose built fiberglass kayak for many years, with doubleguns. If I use bismuth in my vintage ones, I go with 4s. Reason, you're shooting the toughest shot there is to bring a duck down dishrag dead ...... the rear-ender. You've got to drive shot up though the innards into the vitals because there's a good chance the head will be hidden behind the rest of it's body. It takes heavier shot to do that cleanly, and 4s will do it better than 5s in my opinion. I wouldn't use #6 bismuth for jump shooting any ducks. I don't do any jump shooting here until late season, times when it gets cold enough to ice over the ponds and lakes, causing all the ducks to be on current where there's no ice. Full plumage by then.
I just can't recall a missed shot, over my duck hunting life, that I believe was caused by using too large a shot size.
SRH
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