Looks just like my .264 Win. Mag. I had built on a Win. 70 action. The hole in the bolt face was way too big. A 'smith did a hard chrome plating job on the last 3/8ths inch of the firing pin then ground it down to about 2/1000ths smaller than the hole's diameter.
I've seen large rifle primers with very rounded edges indicating a mild load actually have higher peak pressures than SAAMI specs. Such is life with hard, thick primer cups. Soft, thin cups will show their edge sharp at very low pressures. All of which makes it hard to generalize that primer shape after firing is a good indicator of pressure.