I've subscribed to Elmer Keith's theory, 'If it ain't big, it ain't sh*t!' for years. I think he knew a thing or two about 'big' calibers, having grown up with a 30-06 as his first rifle. Then going on to help develop both the .357 & .44 magnum. When concealability is an issue, I carry my NAA .22. When it isn't I carry my 1911 in ,45 ACP. Then if I am feeling particularly frivolous, I carry my New Army c&b in .44. At none of these times do I feel 'under armed' with even my NAA .22, Among other things, I believe that shot placement is important and often practice shot placement under stressful situations.