Dave:
At the risk of beating this long-distance problem to death, let me suggest that it may indeed be the hulls that are at fault. But not because they're the new AA HS. Instead, it may be because they've been fired in an other gun... most likely an autoloader with a sloppy chamber.
Such a chamber allows the rim of the brass head to expand too much. This wider rim balks at falling completely down into the sizer collet and resting in the collet recess cut there for the rim. It stops 1/2 or 2/3 of the way down. You pull the handle and the brass head is actually extruded by the force of the collet at times. At other times, the primer is not fully punched out.
Solution: follow/guide/push the hull down to full bottom in the collet with your fingers as you pull the handle for the "first reload" and you're good to go from then on.
I know this from experience. But... your problem may be elsewhere.
Best, Kensal
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