There are different "kinds" of geese, within the subset of Canadas. There are your big, fat, stupid golf course geese. Tough to bring down with body blows, but they tend to decoy well. Then there are your "hunting pressure" geese. High flyers, pass shooting, etc. Then there are your northern flight field geese, which may pay a visit to your late season diver or mallard spread on open water, also usually decoyed well or skating in low and slow on the mist looking for a picked cornfield. For the first and last type, I use exclusively Kent Faststeel 3" #1. Any other steel load in the 1500fps range will likely work as well, but they are hard to find in this shot size. I've found 2's to be a bit small, BBs to not fill in the pattern sufficiently for head and neck shots. Speed kills, head and neck kill. Learn to put sufficient pellets on the front of the goose with a tight choke and the fastest load you can tolerate (NOT the heaviest payload), and geese will fall for you. For the middle variety, I still carry some Federal 3" tungsten/iron. These aren't made anymore, which is unfortunate, they were a heck of a load. Mine are sized BB. I fire all of the above through a Carlson's "pass" choke. Geese fear me.