Looking at .38 +P ballistics from various manfacturers and comparing them with Sierra load data ( who swears they dont publish +P data ) something dont match up. With the Sierra 140 gr. JHP I am loading to 950 fps on their chart for .38 spcl. That dont even top out to the max load but is super accurate out of my 4" Armscor revolver. All Published ballistics I can find list .38 spcl. ammo topping out at around 850 fps. and +P starting at 850 to 1100 for like sized bullets.