...... bc.. I've loaded tens of thousands of rounds of 12 ga. trap loads in AA hulls. I've also loaded some pretty hefty field loads in those same brand hulls. The brass height thing is, as I understand it, a carry-over from the "old days" when it was felt additional support was needed with a heavier powder charge in the old paper hulls. It therefore meant if it was a "high-brass" shell, it was a more potent round than a "low-brass", which was loaded to a lower pressure level. I think the ammo companies continue to perpetuate the myth and realize the old adage about the brass height is a selling point even yet.