One day, in my early deer hunting years, I chose a semi-auto shotgun with all slugs, for hunting in tight going and jumped a deer almost into a patch of alders. It ran from right to left about 35 yards away as I stood several yards in an adjacent field. I fired several "aimed' shots, but each round hit one or more alders and deflected away from the deer. It was disconcerting to see how poorly they "managed" the conditions. Some hit several alder branches.
Another time, I was hunting with a shotgun and slugs in a snowstorm and followed a smallish doe's tracks in light woods, with about 4 inches of the white stuff. As I stopped for a minute and looked ahead, the deer was standing broadside, under an 8" diameter fir. I fired, and as I recovered from the recoil, the deer was visible anymore, so I expected to see it down. I got to the tree and the deer wasn't anywhere to be found and there wasn't any hair or blood. I looked at the tree trunk and found that my slug had hit a little more than an inch from one side and remained embedded in it, going only part-way through the 3" thickness near the left edge. If I'd made the same shot with my 30-06, it would have gotten the deer, which was only a foot or so behind the trunk. That was one of the last times I used a shotgun to hunt deer.
I recall hunting deer with a shotgun and slugs only once since those times, but it's a long story, so I'll spare you this time.
JP