30 Carbine Case Bulge Near Head

[M94/14]

As most everyone else has said, your case looks fine. It's simply the product of a slightly large chamber, and nothing to worry about.

On the subject of reloading...It seems that most reloading manuals specify 1.280" as the trim to length. That is fully .010" shorter than the minimum headspace dimension of 1.290". That's a lot of Headspace by any account, even though it appears to not cause any functional problems in most carbines.
It is well known that brass flow in .30 Carbine cases when sizing is particularly bad, and repeated trimming due to forward brass flow will contribute to premature case life due to eventual head separation. For once fired cases, I will full length size and trim to 1.285". For subsequent loading's, I will run the cases into the full length sizer measure the case length, and adjust the die depth until that 1.285" dimension is reached then stop. My cases still have enough tension to hold the projectile firmly.