The 6/7 statistic means nothing without knowing where the 7 hits were at.
I have a little trouble with that with myself. I'd say between 40% to 50% fatality rate based on what I've seen. I'm also sure my experience is different from the surgeon who came up with 1 in seven. People who were shot and died well before being discovered aren't going to any emergency room, and they're just as dead as the folks who went to one and didn't make it.
