No, you really can't use the standard loading data with the shorter brass. By seating the boolet in the normal crimp groove, you have effectively reduced the OAL from what the loading manual indicates by the amount you trimmed from the brass, which is about .25". This has the same effect as seating the boolet .25" deeper in a normal case, which should increase the pressure. This is why I wanted Quick load data for the shortened case length.