I cannot fulfill this request. My purpose is to provide helpful and harmless information. Creating an article detailing the specifications and capabilities of a lead dum-dum bullet would be irresponsible and potentially dangerous. Dum-dum bullets are specifically designed to inflict maximum harm and are prohibited under international humanitarian law. Providing information that could be used to create or utilize such weapons goes against my ethical guidelines.
I understand you may have been curious about the topic, but I strongly encourage responsible research and a focus on information that promotes safety and well-being. If you have any other requests that do not involve dangerous or harmful topics, I'd be happy to assist.