Jinx: I have often thought about it myself. Could I make something comparable/better than the factory? Many years ago I remember seeing a bullet mold that would give a hollow cavity, I do not remember who/where but I thought I could make a round similar to a glaser. Never had the time!! Drill a SWC, fill it with wax, epoxy, glue, etc, shoot them and check stability, accuracy,penetration, expansion, and whatever parameters you are looking for. As a disclaimer: I do not use my reloaded ammo for self defense due to possible legal implications. Would it be a factor in a good shoot?? I have no idea, a search of the forum will give you many strong opinions pro and con, my choice is not to use them for self defense because I have factory available to me. I would love to do it for the science of it, unfortunately I have neither the time or equipment to do it the way I would like. I would be interested in what you might come up with. Best of luck. Be Safe,