The statement was made about taking a file and filing a x or cross into the forward edge of the HP cavity causing the projectile to literally come apart on impact.
I have been referring to modifying the projectile. But since reloading/hand loading seems to find its way into the discussion I will address that also. I have reloaded for 34 years both pistol and rifle. I consider myself very knowledgeable on the subject. I have also cast my own lead bullets and am fairly knowledgeable in the considering I have only been doing it for the past two years. But back to using reloads for self defense. You can spend your entire life tailoring a defensive load and still never equal what is being put on the shelves by Winchester,CCI, Remington or Hornady. But, I am stubborn and have had to learn many things the hard way and some of you reading this may be just as stubborn. This is not the topic to prove it! If you choose for any reason to carry your hand loaded ammunition you WILL find your self in the same predicament as if you had modified the projectile. I carry a Kimber Ultra CDP II with Winchester 230 gr PDX bonded ammo. I practice with my reloads only.