Also one has to look at Hegseth's training age. He played football in high school good enough to hold a few state records at one point. He also played basketball.
He played college basketball all through it
His military career is noted for his love of PT and Crossfit. He enjoyed so much it was used against him in the media when Trump picked him.
He's 46 now, let's assume he starts benching at 13-14, which is the age many start thinking about high school ball..... That's 22 to 23 years to get a hard #315.
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On the powerlifting front, I put him as a 82.5 / 181 class lifter, although that is probably a few pounds light -
https://www.openpowerlifting.org/rankings/82.5/usa/men /
https://www.openpowerlifting.org/rankings/raw/82.5/usa/men .
There are literally pages of guys way over #315 just in the US.
Also, that is not a competition bench press. He'd be called for butt lift certainly. I've seen others from him that probably could get called for uneven extension, bar not under total control, foot problems, etc.....
This was a gym quality hard bench for him, and he probably got it.