Wiktionary
keyholing
n. 1 (context firearms English) The tendency of a bullet fired down an excessively large barrel to wobble in flight and leave a keyhole-shaped puncture in the target. 2 (context lasers English) (rfdef: English)
Usage examples of "keyholing".
There were dots of blood on the back of her tunic, and a great splash of scarlet and lung tissue blown by the keyholing bullets onto the walkway where she thrashed.