The +p generally means a heavier bullet or about 100 fps for the same bullet in a 2 inch revolver you won't see a differance in an extream case 1inch at 25ft maybe . The load data is in all the manuals now . The 38s function fine in most all of the 357s , the 357 will have more trade in value later also if you put them side by side alot of them are nearly if not identical . Is the 85 the little5 shooter ? I had a "j" frame S&W the hand loads I had for it were ..........uh...........hot. That revolver was small enough to forget about on your person .