It seems that there is some confusion about weather or not Mag Safe brand ammo would be safe for use in the p-3at. On their website they claim that it is now safe for all but the Davis or Grendal p-10 but there is no mention of the Kel-Tec p-3at. After reviewing data I do not see any advantages in carrying this ammo for defensive purposes in ANY 380acp. They seem to boast about fragmenting and velocity ratings in excess of 1700 f.p.s. The problem I have with that is that the bullet weight is a mere 52 grains! I personally have an issue with that! Common logic would dictate that in order to have proper "knockdown" or "stopping" power you would have to incorporate a heavier projectile than that! On the other hand you can't ignore the sheer velocity that these rounds produce in cojunction with the fragmenting action they incorporate, with all that said, I tend to take the side of the larger weight bullet and lower velocity of more common "self defence" rounds ie; Speer Gold Dot, Federal critical defence and so on. Theres also the question of the barrel thickness of the p-3at, in that case I believe that the gun can handle these "rifle velocity" bullets but find that they are no more useful than standard personal defense rounds. Personal defence is no subject to be taken "lightly" (no pun intended) I just prefer a bit more substance in my carry round's. Please feel free to "weigh-in" on this highly controversial subject.