Are you saying you had a bad experience and cannot hit a coon at 35 yards so the rest of us should not do what we have been doing successfully?
I'm saying that before someone walks out his back door with an unpatterned shotgun and STEEL shot and starts banging away at a raccoon that may be anywhere from the size of a basket ball to bigger than a wheelbarrow, That person should:
1. verify that he can hit a raccoon in the dark with a shotgun with bead sight, right square in the vitals.
2. Get a load that isn't STEEL BB, because nothing you say will change the fact that a load of steel bb is going to have to put a lot of pellets on target before it will kill a coon at that distance.
A goose hunter I've talked with has told me that they get about 3 inches of penetration. That will not normally give a clean kill on a big critter, especially if the thing is barely hit with the edge of the 30 inch circle, as its running away and the guy with the shotgun fires a round at a running target in the dark.
If letting a badly wounded critter go off and bleed to death is acceptable, use anything. bricks work real well.
If this is something that the OP isn't comfortable with, he needs to use another weapon.
and just to clarify things, are you stating as a fact that you have shot and killed raccoons at 50 yards with an 870 twelve gauge with steel shot loads, or was that just meant as some sort of vague cheap shot at my hunting skills?