There are a couple of simple easy adjustments you can make to the MEC to keep them from bending in the middle but it does take some time to figure out the correct combination. My loaders used to do the same thing but they now work great and the same setting will load both AAHS and also STS with no loader adjustments.Folks, that is why I see AAHS hulls in the trash at the club. Nobody is tossing STS. Actually, AAHS just need some TLC to load on some loaders (mainly MEC)
I find the HS AA's last longer as well. Especially in the 28 and 410 gauges. You just need the shorter wad or less dense powders for the 12 ga. I am not awar e of a shorter wad for the 20 ga. So you have to use a dense powder for that one? Unless someone knows of a shorter wad I am not aware of??? Then they load nicely. Of course the same combo does not always work as well in the STS hull now. In the past with the compression formed hulls. Both the AA and the STS loaded up darn near exactly the same with every combination of components. Those days are gone. I load what I can get the cheapest. I get 2 bucks back from Winchester on each box of there shells. Their primers fit perfect, and are much cheaper than the STS. Its a no brainer for me. I still load STS's though. I have a nice stash of them? Pick one and go for it. There both good. Just a bit different. I will say its a huge PITA to load AA primers in STS hulls in the 28 ga. The primer does not fit worth a tinkers damn, and its very hard to enlarge the primer pocket installing the AA primer. I have to do it as a separate operation the first time on STS hulls in the 28 ga. I still have about 400 hundred or so once fired too!!! break em all JeffI agree that they are both good hulls, however I have found the AA's last considerably longer for reloading.