Those two spots on a deer are fairly far apart, not sure how you went from chest to liver to above the spine??? Are you and Teenagehunter aren't brothers???
I can promise you that if you grazed him, you didn't have blood for 300 yds. I'm also throwing the BS flag that your buddy is able to tell muscle blood from any other type of blood. The blood that flows through the veins and arteries that feed the muscles is the same blood flowing through the heart and lungs. Only way your distinguishing which organs you shot such as a gut shot and a liver shot, it upon impact. Gut shots have the obvious fecal matter and smell, your liver shots are a darker blood and well your lungs shots are bright bubbly pink blood.