First, concealed carry has nothing to do with caliber... It has mostly to do with your build and environment.
Let's talk about your choices, semi auto, revolver, single stack or double stack semi. Your choice of concealment depends on your build. Thinner people have more options than heavier people. What you have to do physically has a lot to do with how you will carry, regardless of what you carry. Do you have to bend over a lot? Do you wear a suit? Do you have to lay down on the ground, face down or face up very much?
1) wear a suit, nearly the sky's the limit, long coat tails to cover your pistol, probably not laying down anywhere. Inside the waist band, at strong side hip is optimal.
2) Like me, have to bend over a lot, lay on my back in front of people, or lay down in front of people not wearing a suit or jacket, pretty well makes me carry in the pocket or an ankle holster, ankle holster is also risky in my normal routine, so I carry in the front pocket. I have a C6 Para, that is indeed small, and will fit in a front pocket, but in a firing grip while in the pocket is nearly, impossible to draw.
3) Try different models, in the front position, iwb position, crotch carry, etc... and see what works for you, in your normal. everyday environment..
4) A belly band holster underneath your armpits is a very good setup, and works as well as a front pocket carry, and allows for larger pistols.
I hope this helps.