thats the whole idia.that a bigger cutting size will make a bigger whole.but i have a friend that shot a doe with a very wide mechhead it slow the arrow down so much that he almost did not get the arrow threw the other side.he did say that the deer only ran a few steps then fell over.but i have done that many time.with heads mech or fixed with only 1and 8th or smaller.just put the arrow where it needs to be.and it does not matter nothing is go very far!