The birds are typically 15-40 yards, granted.
I know that shooting someone at HD ranges is different, but my gut-instinct tells me that it's not a great idea.
As I said in my post, I'm not an expert, but I've shot a lot of birds. The bigger the shot, the harder they fall. I'm assuming that's the case, no matter the range or the recipient of the lead.
Just by your original post, you're admitting that they don't penetrate like buckshot. Hard to argue that, whether it's the bad guy or the wall, you're not going to get optimal penetration.