I've haven't used any 7mm X-bullets of any weight so I can't help you specifically with your 7mm-08. I have tried .338 cal 200gr X-bullets on two Whitetails and one Black Bear. I know this bullet is primarily considered an Elk bullet but I gave it a try anyway. IMO it was too much bullet for the deer and ok on the bear. If you like this type of bullet you may want to check out Winchester Fail Safe ammo. The Fail Safe is very similar to the X-bullet in design and performance.