Brandon Herrera did it recently. Didn't get enough of a gas seal on the .50 cartridge to get any real velocity on the round the first time. Eventually put a plastic sleeve around the casing so he could get the chamber pressure high enough for a catastrophic failure.
I think it was Edwin sarkissian who did this in one of his YouTube videos. If I recall correctly it didn’t really work
Brandon Herrera did it recently. Didn't get enough of a gas seal on the .50 cartridge to get any real velocity on the round the first time. Eventually put a plastic sleeve around the casing so he could get the chamber pressure high enough for a catastrophic failure.