The difference is in their bullets. The training round has a full metal jacket (FMJ). It's a simpler bullet design, with a lead core with a copper outer layer that promotes smooth feeding and a cleaner bore over the course of a shooting session. The self-defense round has a jacketed hollow point (JHP). It's the most common self-defense bullet design, with a nose cavity that enables it to expand significantly as it penetrates soft tissue. By expanding the JHP transfers a greater amount of its energy to its target, and creates a wider wound channel.