I have not used them on game yet...a very good friend in Colorado has them in a custom 300 win mag 180 grain and has killed 2 Bulls with it and a mulie and has had perfect expansion, it is the most accurate bullet he has shot out of the gun . How in the world can a bonded bullet be frangible especially one that has such a thick copper jacket? The only thing I see about them is that they are a long bullet and are a little sticky because of the jacket so you have to load accordingly. IMHO comparing a BT with this bullet is like comparing a chevette scooter with a Ferrari.