I recently picked up a few boxes of PTP/SP 91grn 9mm ammo. From the reseach I've done (and translation thru babelfish as this is german ammo). It states it is a 91grn solid core bullet moving at 1375 fps. It looks like a fmj round but has a small hole one end of a paper clip can be pushed into. The paper clip feels like it bottoms out on the base of the bullet. Due to the weight, velocity, and hollow core would this be a good defensive round?