I have been curious about them for deer. I don't want to be a person that fights progress. Though I am concerned about pentration, on non lung/heart shots.

The failures, were they seem to be more 6 and 6.5mm. How are they on full size rifles?

I know someone who blem a massive hole through the heart with 30-06. But again, I wonder how they are other areas. I suspect if that was your only shot, they would be the way to go.