My first thought is you need to adjust the depriming station and lengthen the deprime pin so it goes completely through the primer socket. However you said you have exerted so much pressure on some that you have distorted the bottom of the hulls, this suggests the primers are somehow fused to the hulls beyond their normal friction fit. How old are the hulls, did they get wet? Perhaps they were fired with excessive chamber pressure. Does this happen with any other type of hull? If not I am guessing the problem is the particular group of AA hulls you have and if so I would pitch them and start with some fresh clean ones. There is nothing inherently wrong with AA's for reloading, I prefer the old one's and I think the Remington STS/Nitro 27 is superior but you should not be having any problem depriming them under normal circumstances.
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