El Tee,
Sorry- just now saw the question.
The Federal LE127 00 (9 pellets, 1325 FPS) I've tried patterns amazingly well out of a CYL bore. Patterns at 25 yards are about 3" in the only 870 handy with an 18" barrel.
The Hornady doesn't do that well, perhaps because it moves out at 1600 FPS, but it will keep all 8 pellets on an 8.5X11" sheet of typing paper at 25 yards. That's my basic requirement for a defensive shotgun/buckshot combo. I haven't seen any 'deals' on the Hornady lately and we're about out of it, but we recently took delivery of a couple of flats of the Federal LE127 00 from ammotogo. I'll be buying a couple more just on GP. I like that stuff...
I'm not willing to argue over whatever you choose to load your HD shotgun with. Close enough, and indeed it doesn't matter too much- if your shot load is delivered to the right place at the right angle of incidence and achieves adequate penetration. Personally I can do with as few ifs as possible. There's more data out there regarding 00 as an antipersonnel load than any other shot size I know of, and I'll stick with what seems to work.
Admittedly I'm fortunate in that I don't have to worry overmuch about overpenetration or stray pellets, given no close neighbors and just my DW and me in the house.
Stay Safe,
lpl/nc