[gdmoody]

I don't know if I have ever seen any bulging like that before, if so, I don't remember it. Are all 300 cases the same headstamp or are they all mixed? If not all same, are the 8 bulged oes the same? If it was only 8 of 300, I would throw those 8 away. I would keep an eye on the rest as I shoot a mag full and see if there is any certain thing that may be happening to cause a bulge! I don't know what it could be but just listen closely as you shoot and if something is different, find that piece of brass and look at it.