Petzal apparently believes (as many people do) that weight retention is the ONLY factor in bullet penetration, and it isn't. Frontal area of the mushroom is at least as important, and perhaps more so. This can easily be demonstrated by shooting various bullets of the same weight, diameter and muzzle velocity into the same media. But there are plenty of hunters who never get beyond a belief in sheer weight retention.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
