HookMeUpII
AH fanatic
I don't have the time to contact all of the guys in these photos to ask permission to show their face, hence the dimes. EVERY bird pictured was taken with steel shot. I would say that a Canada goose is at least as tough physically as any waterfowl. Not as fast on the wing as some but they hold their own.
Canada's are actually very fast. They are deceptive because being so large, it doesn't seem like they are moving. They are in fact, moving quite fast. They tend to cup up way out as well. We've learned that with them, wait till they start backpedaling over the decoys. Trying to nail them cupped up is not always best.
In terms of toughness, well, it depends on what you compare them against. If you're talking divers like bufflehead, bluebills and sea ducks, it's hard to find a tougher duck. I've seen divers take 2 shots of #2 steel, dive, come back up and take another shot to finish them off. Brant, very fragile. Mallards, also semi-fragile. Black ducks are pretty tough. Snow geese, much more fragile than their cousin the Canada's. Can't speak to Specks as I've never gunned for them.
Steel works if the birds are in close. However, that's not always the case. The below pic was an early season hunt. At that time we were using all steel. I have to say, it wasn't pretty. We were chasing birds all over the field despite taking most shots at no more than 30 yds. The ones hit slightly farther out turned into a dumpster fire. Chasing birds across the field before they run into the hedge row, running after them left and right as other birds were coming in, etc. It was during our September resident-cull season here but still...I'd rather not go through that.
For me, bismuth is worth the money to not have to do that. In the odd event they aren't dead with one shot, another follow up almost always does the trick.