I’ve had a couple with no blood trail.
One was a buck that got heart shot with a 150 grain .308, about 100 yards away. Federal power shok ammo. No exit wound, but the buck fell right where he stood after spinning a 180. May not really count since there was no “trail” at all really. But, illustrates the point that if you destroy the heart, and, don’t have an exit, there likely won’t be much blood exit the body.
Other one was a buck at about 30 yards. I was level with him and the shot was high double lung. 45-70 with a 405 grain bullet. He was dead maybe another 70 yards away, and there was almost zero blood between where I shot and until a few yards of where he laid, there was a good splotch of blood on the leaves. I think I found one pin point of blood where he was shot, and then I just grid searched the next 70 yards until I found him. I don’t think any bullet would have done much different there, but all that energy didn’t help leave extra blood either. High in the chest cavity and a bullet diameter entrance and bullet diameter exit meant that the chest cavity had to get pretty full of blood before it started flowing out. At least that’s my theory. And you see lots of archery guys share similar experiences with high lung hits.
Bottom line, both big and small bullets can leave a lack of blood. That doesn’t really indicate anything for or against overall lethality. More blood is not bad, but a dead deer 20 yards away with a liquefied heart is not a bad thing either.