*Opinion, not rooted in any legal precedent*
Wouldn't worry about it. Such a low yield sort of thing to worry about. To my way of thinking, the odds of you using your weapon, having the ammo examined to the point that they determine it was handloads, then that info being used against you...are pretty slim. Even if some attorney puts forth some sort of "more deadly" argument, I'd think YOUR attorney would point out that you only shot in a situation where the law allowed deadly force...and there's nothing more deadly than deadly. HP's are accepted as self defense ammo when factory loaded, so by logic, they should be okay in your handloads. Heck, you can buy the very same bullets, powder, primers and brass that are used to build commercially available ammo. Would hope it doesn't matter who actually puts it together.
ETA: If I load once fired Hornady brass with the same XTP I fired out of it the first time...could you tell the difference?