Sure, I'll be happy to help. Once metal reaches plastic deformation (irreversible) it will never be the same again. So go ahead and do yourself and everybody else a favor by doing the right thing and putting it where it belongs.
I bought a new Remington 1100 Classic Trap a few years ago that was the same way. It wasn't really noticeable until you looked down the side of the barrel, but then it was very evident. I believe it was a light contour barrel and I think they are just made that way, probably to provide a little more metal for the choke tube threads. I'll bet your Hastings was made that way too. I wouldn't worry about it as long as the choke tubes seat properly and it isn't so flared as to be an obvious flaw.
It's supposed to be flared out. It's done to allow the installation of the choke tubes without having to remove metal from the barrel. Read my post in the other thread about the barrel being opened up at the end.
My barrel has the same flaring, and other guns have that as well.