The biggest I carry concealed, and only at the ranch, is my 4" Ruger Redhawk in a DeSantis Scabbard, worn OWB.
My usual carry weapons are both 4" semi's.
Wilson Combat Professional 1911 in a Milt Sparks Versa Max 2 carried IWB
or a Springfield XD-45 Service in a Brommeland Max Con V carried IWB