The A-10 (USA) actually doesn’t eject it’s bullet casings, which, in war thunder, they do.
This is quite innacurate, so I hope Gaijin would improve this part.
watch the video below(skip to the last part).
Why Reloading Modern Weapons is Harder Than You Think - YouTube
Go make a bug report on the site for that:
https://community.gaijin.net/issues/p/warthunder
Take screen of the A-10 in game who eject his gun cases and you video.