I first used bear razor heads. They worked fine if you hit them right. But the blood trails were " a spot here, a spot there" and every now and then a puddle. Then I started using 100 grain thunderheads. They did better. The blood spots seemed to make more of a " line" than a spot here or there. Then I went to the thunderhead 125. They were kind of a mystery. One deer there would be blood everywhere, the next, they were like the razor heads. All were good hits but I didn' t like what I was getting. So then I swiched to the 90 grain 4bladed muzzys. WOW!!! I' ve never seen trails this thick in my life! My step dad made a few bad hits on deer and we still found all of them. They make a very large hole through the deer. I got two in the heart and I had a three foot wide bloodtrails.