You can load them with any .38 Special data for that weight bullet. They may not be as accurate as .357" or .358" diameter bullets, depending on your barrel. Some of the older Colt Pythons were bored at .356", and were considered to be more accurate because of it.
Depending on your expander plug, too, the bullets may be loose in the neck of the case, but not necessarily so. Many people routinely load 9mm bullets in .38 cases because they want to use that particular bullet weight. You don't have to worry about using light load data with a smaller diameter bullet, but if the case were reversed, such as using .357" diameter bullets in a 9mm (.355") bore, then you would have to work up your loads accordingly.
Hope this helps.
Fred