I have shot slugs in my shotguns, and found the following advice on full chokes;
Slugs and full choke on old guns
IFish Fishing Forum
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Sep 25, 2020 — Take one of the slug shells, Cut the slug out of it. Drop it down the barrel. If it slides right on down. You are perfectly safe shooting them.
That makes sense to me, if indeed the 220's are full choke models. I see shotguns as being mainly used for bird hunting, and I have only bought slugs for mine in case I need to shoot a bear on our acreage that will not go away, without worrying about something like a rifle round that can travel hundreds of yards to nearby roads or our neighbours place. I also carry a folding shotgun in a small backpack when we go berry picking now, and a slug in my shirt pocket. I never had a bear go after us in the berry patches, but they can be unpredictable. Would I have time to get the shotgun out and load it if a bear came after us? Maybe not, but I do feel like more relaxed knowing I could try and shoot an angry bear, before becoming the subject of one of those Far Side cartoons about hunters!
By the way, slugs do have more recoil. I noticed it when shooting grouse with my 20 gauge and loading in a slug by mistake instead of the #6 birdshot I normally use. Target loads usually also have less recoil than game loads.