Best 38 +P round .

[Scorpion520AZ]

Winchester still makes an oldie but a goldie that's reasonably priced at about .80 per round:
38 Special +P 158 Grain Lead Hollow Point Semi-Wadcutter

Winchester Super-X Ammo 38 Special +P 158 Grain Lead Hollow Point

 

[Firesticks]

Nothing wrong with the Speer 135 grain GDHP however I believe the Buffalo Bore #20A is even better.

The 158 grain LSWCHP-GC bullet leaves a 2" Chief's Special at 1025 fps - confirmed many times with my Chrony. Not only is it about 200 fps faster than the GDHP, but it is 23 grains heavier. IMO it is about the best you can get in +P .38 Spl. if you can handle the stout recoil. Not too bad, but you'll definitely know it's something different!

The BB is also really accurate, about the most consistent load I've ever shot, and I've never had one single hitch with them.

BB is thee premium ammo. It is a step up from the FBI original FBI loading. It is also made in +P. This load will not be comfortable in a J frame. My carry is Buffalo Bore LSWC 158 hp standard pressure in my 638. Item 20C/20 158gr Soft Cast LSWHP-GC 850fps these are low flash for short barrel revolvers.