Rounders, The Cincinnati Kid, Twenty-One and some other movies listed here https://casinority.com/10-best-casino-movies/ - it's my favorite topic.
Have you seen The Drop? I didn't know what I was getting into... James Gandolfini, Tom Hardy (who is amazing in this movie) & and Noomi Rapace are quietly intense. A quiet bartender gets robbed, rescues an abused puppy and ends up entangled with murderous Chetchen mobbies
Worth your time