Wasnt a Mossberg 500, but a Rem870 using SST's. 2 rounds into the boiler room but neither round came out the other side. I recovered one round just under the skin on the opposite shoulder, full expansion and only one petal broken off. Both shots were approx 80 yards. One round went through the close shoulder and prolly hung up in the opposite shoulder, deer ran about 20 yards and stood for about 5 minutes, then laid down for about 10 minutes before getting back up. After getting back up, the second round entered just behind the rib cage (quartering away), and was recovered just under the skin in the opposite front shoulder, pile up about 30 yards later. Had zero blood where he was standing and laying and no blood trail that I could find following the second shot, chest cavity was full of blood.