I had the same thing happen to me this year, I was using factory 30-06 168 gr winchester supreme ballistic tips, pretty sure they are the nosler ballistic tips. Shot a deer at 150 yards steep downhill, didn't aim low so I hit him a little high and took out the bottom of the spine. I was surprise to see the "on bone" performance of these bullets, certainly not what I expected and not much damage considering. The bullet punched through and was never found, deer bang flopped. I was a little leary using them at first but now I will use them again next year. FYI 180 gr winchester supreme nosler accubonds impact almost exactly the same.