I'm having trouble replying so I had to start a new topic ..I shot a 55# hatfeild with 125magnus broad heads... I don't like using 2 blades because when shooting into the chest cavity the negative pressure from the lungs and diaphram seem to suck the broad head wound close, were as the 4blade doesn't allow this, leaving alot better blood trail to follow...But the 2blade will penetrate just a little deeper.. .