Are you sure they are Winchester AA hulls and not the cheepie Winchester Super Target shells? Does the hull have AA on it or a W?
The Super Target shells have a steel base. If the hulls get wet, the primer rusts in the steel base and are very hard for the MEC to punch out. If you examine the primer once you get it out, is there evidence of rust?
I reload Federal Top Gun and Estates quite a bit. They also have steel bases. My MEC hydraulic will not always punch those primers out. The hulls jams in the collet and will not rotate on the turret. It's a real problem getting the hull out.
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