Take this advise with a grain of salt. I agree with Drew. If I owned the revolver I'd tote it with a good brand of +P 158 grain ammunition whether it's rated for +P or not. All my 2-inch and 4-inch .38 Specials are so loaded when in use for personal protection. It hits hard and has a good reputation, both in print and in my observations of the use of it afield.
If I was concerned about Smith & Wesson's caution then I'd be happy with any standard velocity 158 grain semi-wadcutter ammunition.
Y'all are familiar with Erich's sigline, I assume ...
Quibbling over the difference between 125 vs. 110 grain bullets is probably little more than mental gymnastics. Now, having said that ... I've found myself migrating to heavier loads, hearkening back to my physics lessons of inertia.
Bottom line is probably what Chuck said though, whatever you can find!