Does Keanu Reeves hold a gun more properly than Sylvester Stallone?
https://qph.fs.quoracdn.net/main-qimg-3061b44ad59646a88985d3078abee03a
Holding your wrist or under your hand does nothing and shows you don't know what you're doing. And you don't lock your elbow, you'll throw off your aim.
https://qph.fs.quoracdn.net/main-qimg-bd217277d7d23a579962400f626c7754
https://www.quora.com/What-is-something-movies-always-get-wrong/answer/Kat-de-Clercq