I see no upside to using Buckshot, the pellets start losing energy fast after 35 yards. While smooth bore slugs carry a lot of energy out to double that.

If you have a smooth bore; Brenneke classic slugs shoot hot (1500 fps) and don't really loose a lot of energy or velocity out to a hundred yards. I've shot 2.5 MOA with them at a hundred yards, 22 inch barrel 3X scope.

One thing people fail to consider with buckshot is the pellets are light, with a relatively large cross section and they don't penetrate fur well. I've gotten solid hits with 00 Buck at 35 yards on a running Fox and they didn't even slow down. Best guess is the fur greatly reduced the penetration. I've actually had good results with 2 shot, best guess is the smaller cross section of the pellets actually helps with penetration while passing through fur. I really don't understand the physics of it, but after shooting many dozen of Fox I can tell you for a fact smaller shotgun shot (BB or 2 shot) just works better on Fox. There is a reason the FBI uses 4 Buck instead of 00 Buck.

I've been underwhelmed with my 00 Bucks results on animals a whole lot smaller than Bear. I wouldn't even consider using 00 Buck on Hogs or Bear. Slugs are usually big hole in, big hole out and leave a good blood trail that is seldom needed.