In plain english, it depends on where they hit you and how fast they are going when they hit you.Which would stop you better. A small ballpine, or rock hammer, or a 12 lb. sledge hammer?
In plain english again: This subject has been the topic of endless debate for many decades. What is known for certain is that WHERE a bullet hits is by far the most important factor in "stopping power". The homemade formulas, the speculation, the down-home analogies all fall short because this is not a simple topic even though everyone LONGS for it to be simple and most people secretly think they understand it.