I've noticed that differing blood trails with two blade heads are due to how the blade contacts the muscle strands of the body. If the blade cuts perpendicular to the muscle strands, good blood. If the blade cuts parallel to the muscle strands, it appears the blade almost slides through the muscle and the muscle seals back easier and results in bad blood trails. Anyone else notice this?

Also, my son started bowhunting when he was 11 and he was shooting a 38 lb bow. I had him use a 2 blade magnus stinger to hopefully have as good of penetration as possible with the low poundage. What I found was that the 4 blade stinger penetrated equally as well as the 2 blade and provided a lot better blood trails. Since then, I've gone to using the four blade magnus stinger for all my traditional gear hunting.