Thanks for the Taylor index URL I enjoyed it. I am not an expert by any stretch of the imagination but here is my 2 cents. First none of the calculations mean much if there is a pass through because you don’t know how much energy the bullet still has after it exits. Seems to me the stopping or dropping power has more to do with how the bullet enters the animal. I am lucky to have a set up where 9 out ten shots are 100% broadside. This said, if the bullet hits square on a rib the rib explodes and the lung and heart damage is tremendous. The shoulder hit shatters bone early and drops them in their tracks, actually I think it jolts the spine and paralyzes the deer. The bullet has a sphere of energy around it like a shock wave that is an area volume calculation thus the squared function. Had a 270 pass through a 200 lb buck last year just above the heart, never hit any bones and the destruction removed the heart from the connecting arteries and tissue and left the lungs pretty much in tact. Much less damage than a rib bone hit. He went @ 250 yards, I was amazed how far he went. But I guess most of the available shocking energy stayed with the bullet after it exited. After a rib hit the lungs and most of the heart disintegrate. I only remember my 150 gr 270 staying in the deer once. Well the bullet took a left turn inside the deer after a broadside lung shot and wound up in the far side haunch. That one was weird to figure out, in through one rib then out the other side rib cage and back 8 inches or so slid along the skin and came back across the rear guts and stopped in the haunch on the same side as the entrance wound. I mention this because the energy left after the second rib cage penetration was quite a bit. Back to the member who dropped two does, one shot, with pass throughs on both, lots of energy after the first deer hit!!