Agree with what has been said.

At close ranges the buckshot acts like a big slug. Although I don't think buckshot is as popular as it used to
be, where I hunt the underbrush and palmettos are thick, so people used it for that (brush busting). Some people obviously have problems with that (I don't use BS).

With a 3" mag and a 30" barrel, I knew guys who took deer at 100 yards with buckshot. While it increases your chances of hitting the deer at longer distances (due to disbursement), it probably also increases the chance of wounding. My cousin shot a running deer at 100 yards and one buckshot pellet hit the front of its windpipe (like a slice with a knife) and it killed that deer.

If you do use buckshot, I would go with 00 or something large, 1 buck seems small to be using on deer.