Not concerned at all..........
You want to carry the largest caliber that you will carry consistently, if it is a .22, 38 special, 9mm, 40 or a 45, carry that! [TABLE="align: right"]
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The point is to have it with you, not left at home because it was too heavy to carry just to go to the local store for bread...Murphys law is your going to need it the one time you choose not to carry it...
I am not saying a 9mm has greater stopping power than a .45, but there are people who have been shot with a .45 and were hardly fazed and there are many who have been shot with 9mm and their heart beat lasted less than half second afterwards... You only going to pull it when you have to use it to save your life or the life of someone else and very few people continue to come at you with a bullet in the forehead....