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I don't know if that's the right description neck doughnuts I saw that description on another forum. I'm a using L.E.Wilson neck sizing bushing die. The die does not size the whole of the neck I have noticed that there is a slight bulge at the base of the neck. Is this normal.

I'd say that's the neck us only being partially sized. This is a practice on its own that some follow but only a portion of the neck is then gripping the loaded bullet. And if only a portion of the neck is gripping the bullet how much more important is bullet run out and brass thickness of the neck?

I must say that when developing some new loads for some different bullets I acquired, I'm not so sure that the theory of fire formed brass aiding accuracy is the case generally. I'm finding some of my most consistent and accurate loads through my 7mm-08 RPA are with FL sized cases...

it is only a doughnut IF it is thickened both inside and out.

As SIM says, it may just be that its partially sized and this is the bit you have not reached.

try placing a bullet into the fired case, depending on how the neck behaves in your rifle you might find a ridge near the neck/shoulder angle on the inside and this might be a doughnut.

You need a neck reamer to clear them along with some proper sizing mandrels.

personally I would just chuck the brass as replacing it would probably be cheaper in the long run.