This is currently the most efficient method for slaughtering livestock for consumers. It’s efficacy can be measured by the amount of stress hormones released into the meat. The animal doesn’t have time to process the pain of the pneumatic bolt before it is stunned and exsanguinated.
Here is a sciencey article on the subject: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7463084/
they’re joking