Because there not all sterile and gauze is more effective.For serious blood loss I would hope you would use a tourniquet! Other than that why would you not use a sterile product that's cheap, super easy to find, and designed to soak up blood? Tampons fit great into bullet holes too! I know from experience; even if you have to use 2. Grab you a maxi pad/tampon, dump some quick clot on that wound, and duct tape the hell out of it!