That looks like a case of bullet set back. Turns a normal high pressure cartridge into a hand grenade!

I do agree. Only takes one small oversight for pressures to skyrocket. Another reason I like these mid size & smaller cartridges over the magnums, super magnums & such. A double filled 308 cartridge is gonna come apart, the case, sure. Probably blow out the barrel.. might take out the Action, might not. Could cause injury, depending. Chances are, they shooter will be ok. But has everyone seen the the video of Kentucky Ballistics firing a 50cal Slap round in his Single-Shot 50BMG? Very nearly cost him his life. The rifle… an oversized everything 50cal Action, Barrel, Bolt… decimated! It came apart like nothin else. And that is what it will do everytime. 150,000psi in a 308 & a 338 Lapua, or 50BMG are 2 different realities of catastrophic. Be safe