McGarret, Cannon, Barnaby Jones, Mannix, Kojak...all carried .38's.
James Bond carried a .25acp and then switched to a .380acp.
Yawning...
Blackbeard the pirate carried flintlocks that delivered about the same energy as a modern mildly loaded .38.
U.S. Brigadier Generals in WW2 were issued .32's.
Tom Selleck in Magnum P.I. used a .45.
I prefer a .38, but also carry at times a .25acp. Call me old-fashioned.