I've stunned field mice with a 50BMG before (indirectly).
We were shooting using a 20lb propane can (empty) target at 450 yards on a hillside. Makes great targets, just enough wall thickness to get blue tips to flash on impact. When we went out to put the can back in place (it rolled down the hill), we found a number of stunned white field mice within 3 feet of the propane can. They looked dead - didn't move when we picked them up by he tail, but eventually they woke up and ran off.
Field mice are a lot more fragile than humans.
We were shooting using a 20lb propane can (empty) target at 450 yards on a hillside. Makes great targets, just enough wall thickness to get blue tips to flash on impact. When we went out to put the can back in place (it rolled down the hill), we found a number of stunned white field mice within 3 feet of the propane can. They looked dead - didn't move when we picked them up by he tail, but eventually they woke up and ran off.
Field mice are a lot more fragile than humans.