Looking for advice. I am trying to decide between the 9mm or the .40. I bought a Kimber Ultra CDP some years ago and had problems that were ultimately attributed to the short action. I got rid of it shortly after that. Granted, that was a .45, but it totally turned me off to small action guns until now. I am willing to give the Springfield EMP a try but am conflicted about which caliber to get. On the one hand the .40 is a more effective caliber, but is it less reliable than the 9mm? With the latest self-defense rounds (Hornady Critical Defense for instance) is it worth it to go with the .40 caliber? Or to put it another way, if I go with the .40, am I sacrificing reliability? I am not concerned about the difference in weight. Thank you.