Dying from a bullet wound could take seconds to years, it all depends on point of impact. A bullet wound to the appendages could lead to a slower death by infection if hit in a certain spot, or could destroy an artery and lead to death in minutes, a wound to the chest could simply cause bleeding, could puncture a lung, the heart, or cause any other number of wounds. An accurate bleeding out/wounding system would be nigh impossible to code in a Warband mod.