The bulge can also be that the sizing die did not size that part of the case. I see this with 243w 260r 7-08r 308w and many others.

Your chamber is generous around the head and the sizing die doesn't reach all the way down the case, hence why there is a lil bulge, but it's not dangerous.

Like others said, cut a piece of brass down the middle with a dremel and check for brass thinning above the head.