I stand to be corrected but I believe it is called a "squib" load. Happened to me once when doing some load development. Round didn't go bang but more like a pop and no recoil. Thought to myself that's weird and pulled bolt out to try and look down the barrel, obviously couldn't because as it turned out bullet was half way down. Gentle push with a cleaning rod easily retrieved the offending projectile.
Moral of the story is if things don't sound or feel right after pulling the trigger, always check your bore is clear.
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