On my DS I fire my +Ps last and then only a cylinder full just to remember the POI in relation to the sight picture so that I can roughly determine where the carry rounds would hit at roughly the same distance as practiced.
In a typical range session, the handguns I bring get a minimum of 200 rounds each, but not the Det. Spec. because the trigger eventually bangs my finger up a little after about 75 DA shots even with standard .38 Specials. These things were never meant to be shot in extended sessions.