I was going to ask the same thing, what's the real deal with the difference between 3 and 4 blades, 3 penetrates more and 4 makes a bigger hole, how can it when the 3 bladed has a bigger cut. Also blood trails which is better, trying to find a happy medium, good penetration and good blood, are 4's harder to sight in, if so how do you line them up with the fletchings? Does it matter with 4?