^^^ What he said. In my career, I started with a 9mm, switched to a 45, then to a 40S&W. After a shooting incident, I switched back to a 45. And after a subsequent active shooter training, I switched back to a full size 9mm. These were all duty pistols but I've carried almost all of them CCW as well. I can shoot all of them well but I just perform on the next tactical level with a full size 9 or 40.