For a regular CC pistol, I suggest the .357sig caliber. It's fast(high vel), powerful(high KE level), feeds well(cycles), and offers great marksmanship(accurate).
.357sig sidearms have been in regular use by many sworn LE agencies since the mid-1990s; Texas DPS, US Secret Service, VA State Police, FAMS(air marshals), NM State Police, DE State Police, etc.
For a pistol, Id look at the Glock 23 .40(can convert to .22LR/.357sig/9mm), the SIG P229R in .40 or .357sig(DAK format), the PX4 C(constant action) in .40S&W, the P2000 LEM in .357sig or .40, the M&P Shield in .40S&W, P220R DAK .45acp, the S-A XDm 3.8 in .40(with a added .357sig match grade barrel).
Any of these sidearms can be concealed & serve you well.
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