I wonder if that was deliberately done with a string and a caseload of Bullseye or Unique and remotely fired. Hope so. I've seen that around for years, yet haven't heard details.
I take all the beating I want at 28-30 Kpsi. My self imposed absolute limit (In other words, all I can stand) is around 35 Kpsi. There are platforms that are better designed for both pressure handling and recoil.
Similar to my handgun philosophy: If I need more than a .44 Mag with a 300 grain LBT at 1150 to 1200 fps, I get a rifle. Just don't like the recoil, matter of fact, prefer a .460 Rowland in a Glock 21 loaded to just north of .45 Super.
I once got into an experimentation phase with the .30-06 AI. That's when I "discovered" the .300 WinMag.
28 or so Kpsi is just fine, thank you....
