^^^This
When culling Canada Geese, we use .223 Rem with lots of DPT suppressor baffles, from a good distance. It’s a big bird and not difficult to hit cleanly. You have to tune your load to account for the extra suppression but that only takes a few minutes POI adjustment. Shoot in pairs, get yourselves properly sorted out before you take your first shots and it’s not too difficult to take half a dozen between two of you, just gotta be fast.
If you observe them for a while you can see which direction they fly when they take fright. Put three or four guns under their flight path in cover and collect a few more on their way out. Couple of hard out sessions on the geese and they don’t want to come back anymore. Driving geese with dogs towards shotguns is quite common now.
We have terrible problems with these bird smashing spring pasture, and fouling the paddocks and dams, particularly in the low pastures reserved for ewes with triplets or twins. They are now a nationwide pest on a massive scale. On flat pasture with dams or lakes, public enemy number one.
We also have big problems with feral peacocks, which scratch open our wrapped haylage bales, causing the bale to rot. They get the same treatment. Wiliest birds I hunt, peacocks.