Giles, just a thought but my boy and each shot a doe the .400/ both in Winchester, I shot the 215 gr and he shot the 190gr polymer tip. On the blood trail my 215gr didn't leave hardly any blood trail but my shot went through the entire heart and shredded it - so I destroyed the pump, if you took out the top of the heart(aorta) you might have taken pump offline and not gonna get a solid splash like if was still beating and/or connected to the pulmonary piping. Zak's doe with the 190gr did a great job, middle of the lungs broadside, on gutting the heart was still fully connected to the major blood piping, not excessive damage and the blood trail was a crime screen for 40 yrds.