So from what I hear, the SD slows down regular ammo to make it subsonic. Hence, it doesn't like the 147 subsonic 9mm ammo...it slows it too much. Does anybody know if it likes 124 grain or 115 grain? Also...does it like or dislike hollow points? Has any of you ever owned an MP5SD so I can ask a slew of newbie questions on this particular system? Your help would be greatly appreciated. Thanks.