I know what SAAMI say but you have to balance this against the fact that the US is the most litigous place on earth and lots of people make lots of money from suing other people.
Like I say, the two chamberings are not the same but the chances of a gun blowing up are vanishingly small. I mean, how many times have you ever heard of it happening? You have to produce very, very hgh pressures to damage a modern rifle, let alone blow it up. The round may produce 60,000CUP but this isn't anything special. Proof ammo will develop 100,000 and not damage a gun. Also, remeber that the SAAMI guidance