Looks like people have different defintions for fragmention. Most bullets lose a portion of there weight upon striking game, but I dont consider that fragmenting unless they shed there core. I have shot a few deer where the bullet fragmented completely. When I found these deer the bullet pentrated the chest and then came to pieces. The internal damage was unbelivable, butwhat would have happened if the bullet had went thru the front shoulder first. Those deer might not have been found.What I want in a bullet is one that expands close to double its orignal diameter and passes completely thru. Most of my experience with fragmenting has come centerfire rifles. Until the last few years I have always used concials for muzzleloading, so there wasnt much to worry about fragmenation. Now I have beenusing powerbelts and shockwaves for the last couple of years. Took one with each, both were complete pass thru's. A person can't tell much about how a bullet performs on one or two heads of game with them, so I guess time will tell for me on the pb and sw.