The DS-II was rated for Plus +P but it depends on how you define "steady diet."
That could mean 600 rounds a year (50 rounds/month) or less, or it could mean 6000 rounds a year (500 rounds/month) - or it could mean whatever.
While the revolver isn't fragile, gunsmiths that are qualified to work on it are scarce, and spare parts are not always easy to find. Sometimes they are impossible to find.
The term, "Plus-P" can mean loads that are only slightly over regular .38 Special specification, or they can be in the junior .357 Magnum class.
Considering the ever increasing value of the gun I would stick to lighter loads for practice (if you do a lot of practicing) and carry the hotter stuff.
Personally I worry more about finding a load that will shoot to point of aim, then I do about if it is or isn't rated at Plus P. I don't believe that whoever or whatever gets hit will know the difference.
