It depends. Primary purpose is to to protect my dog on a walk (coyotes, rabid foxes/skunks, ).
Have carried: Springfield 1911 MILSPEC 45 acp, Ruger 4" 357 mag SS gp100, S&W 649-2 38 special, S&W 60-4 38 spec 3" full lug, 4" S&W 629 44 mag,
The 3" S&W 60-4 full-lug 38 special has been carried the most lately. Loaded with 148 grain hard cast solid base wadcutters over 3.5 grains of Bullseye.