[Unclenick]

Snuffy,

The idea I had was to compare one medium to the other by comparing how they do with the same type of round, then to extrapolate back to how your's compares. I've seen photos of a number of 13" penetrations by a variety of 230 grain HP loads, so that's the best general data I have to work with. But, I have one datapoint on the 185 grain Silvertip penetrating 9.8 inches, and I found 5 datapoints for a 200 grain +P Gold Dot load penetrating an average of 12.4". Maybe 11" or so for a standard pressure 200 grain, then, but its a guess.

So, while we can't make as good a generalization about 200 as a 230, that's better than what we know now. If we assume about 11 tor 12 inches for it in gelatin, but it only penetrates your material 6", then will know it's about 2:1, and your cast bullets would have gone about 10" in official tissue simulant.