The best thing you can do with that Terrier is to trade it for an equivalent Chiefs Special. .38 S&W ammunition isn't commonly found and pretty well never is cheap. There is not much choice in bullet design (round nose lead versus round nose full metal jacket) or weight.

The .38 Special round of the Chiefs Special is perhaps the most widely available revolver round in the country. Huge number of bullet designs, weights and velocities to choose from. There are inexpensive loadings that allow you to shoot the gun regularly, and I believe that bullet placement will matter most if you ever need the gun for serious, so frequent practice is a good thing..

Plus, you can shoot .38 Special ammunition in your .357 Magnum.

While ANY gun is better than no gun in a crisis, the .38 S&W has pretty well reached the level of a hobbyist item these days. Nothing horribly wrong with it but there really hasn't been any ammunition development for it in 65 years or more. The last big leap forward was non-corrosive primers, which is nice, but doesn't matter at all in a gunfight.