Also rubber bullets are loaded into casings with a primer but no powder, the primer alone can generate enough pressure to launch the rubber bullet.
However I thought one of the reasons they just add CGI muzzle flashes so much nowadays was to take these accidents out of the equation. I think on John Wick even some scenes are using are airsoft replicas and they add muzzle flash and ejected casings with CGI, Keanu does train with real guns though hence it looks so authentic.
Also rubber bullets are loaded into casings with a primer but no powder, the primer alone can generate enough pressure to launch the rubber bullet.
However I thought one of the reasons they just add CGI muzzle flashes so much nowadays was to take these accidents out of the equation. I think on John Wick even some scenes are using are airsoft replicas and they add muzzle flash and ejected casings with CGI, Keanu does train with real guns though hence it looks so authentic.