Well just to stir the pot a little bit, if one does not mind paying for boutique ammo there is always Buffalo Bore .38SPL +P. This stuff has been tested quite a bit by various forum members here and folks else where. It does live up to it's reputation and in some cases exceeds it slightly too. The Buffalo Bore .38SPL +P 125gr loading is the only 125gr load that I'm aware of that will meet and exceed 1200fps. You will not however be able to obtain this type of performance with any ammunition put out by the big three.

Heavy 38 Special + P Pistol & Handgun Ammunition

Various .38 Special from a 4 inch revolver