Dave: I hope you read the rest of my post. I think I make it clear why, in my personal experience, I believe I am correct. I have tracked deer wounded, or killed by other hunters, using everything from a .45 to a 12 gauge with shotgun slugs, and bows and arrows. The B&A kills leave the least blood, IMHO. High hits with any rifle, if there is no exit are the next most likely to leave little or no blood. This occurs because the hunter was up high in a tree stand when he fired the shot, usually. Those are the deer we find with the entire chest cavity filled with blood. and a bit of blood coming out the entrance wound, only to be soaked up by all the fur between the wound, and the belly of the deer.
A half inch caliber wound leaves a lot or room for blood to come out, and for air to go in. The exit would will always be larger, using a PRB, where I can not always say that when a true conical is used. When you have an exit wound that is .60-or larger caliber, you let out even more blood and let in more air.
The last few times I have hunted deer, I have purposely tried to pick my shot so that my ball breaks a foreleg going in or on the way out of the deer. Breaking a shoulder or leg makes it difficult for a scared wounded deer to go very far, because they don't understand why that leg no long works, and keep testing it, only to fall again. That leaves blood on the ground, and bushes, too!
I am sure there are a few deer shot each year with just about any caliber that leave no blood. That is why I learned to read foot impressions, and use blood only as "confirmation" evidence, that also gave me a clue where the projectile hit, and what organs have been damaged.