Yes bullets piece flesh like I said, causing little impact damage until you get into larger rounds like what an AK shoots. An M4 shoots tiny rounds, closer to a .22, and soldiers in our military complain they lack stopping power. They can bounce depending on size, speed on impact, and if it hits bone. Bullets are certainly deadly but the damage types are 100% different. A wider, heavier, longer projectile is going to cause more impact unles the speed is insanely different, but the projectile still has to be large enough to cause impact damage or it will mainly pierce flesh. Also an arrow is more likely to go straight through because once in flesh it cannot be displaced as easily by bone as a bullet would, add that with a barbed arrow designed to pull things with it, you are going down. By down I mean no longer combat effective, not necessarily dead.
Anyways this has gone way off topic, sorry.