I have to disagree that all deer hit in the boiler room go down right away. About five years ago I shot a buck that ran over 300 yds. I shot him with a 44 mag hand gun using ahot loaded Hornady 300gr XTP. There was a complete pass through and both lungs looked like goo. He left a spurting blood trail,
out both sides, and jumped a fence and ran across at least 300 yds of open field and rolled into a ball just out of thefield. Most go right down, but not all. If there hadn't been some light snow on the ground he would have been very hard to find.