The AA's I was refering to that were not marked 'HS' could be loaded with conventional wads. I thought the newer cases which were 'HS' marked needed special 'HS' wads (perhaps not in 12ga, my error then). That was my only point in mentioning the case difference. As Jim correctly points out, they are all still of separate base wad design. I just personally have never used the latest ones marked HS. I avoided the 410 HS hulls when they first came out because I was unable (according to the loading data) to use my large supply of AA wads in them, instead they demanded a special HS wad. What a total marketing stumble by W on this whole thing.