My Dad took a nice mule deer at 50 yards and I shot a whitetail at about 20 yards. Both showed devistating expansion and immediate kills.
At the short ranges, neither bullet existed but internal damage was huge. I suspect at longer ranges the expansion would be a little less but they would probably exit the animal. In the 30-30, it has become our still hunting gun\bullet of choice.
I hope they release the bullets for reloading, also.