Some of the current Buffalo Bore .38 special +P load offerings compared to the 357 at bottom doesnt seem too whimpy to me.

Heavy .38 Special +P Ammo - 158 gr. L.S.W.C.H.P. --G.C. (1,000fps/M.E. 351 ft.lbs.)
38 Special +P OUTDOORSMAN - 158 gr. Hard Cast Keith @ 1,250 fps
Heavy .38 Special +P Ammo - 125 gr. L.V. Jacketed Hollow Point (1,050fps/M.E. 306 ft. lbs.)

Low Flash 357 Magnum Ammo - 140 gr. Jacketed Hollow Point (1,150fps/M.E. 411 ft. lbs.)