Because it has been reamed AI, I would be doubtful that the dies and chamber are matched. The chamber may well be slightly longer than the full length sized case. I have a 2506 AI and it has this very situation.
All I do is neck size and slightly brush the shoulder of the fired cases if they need it, then run them all through the rifle to make sure they chamber - Ackleys dont stretch.
Please check a fired case by priming it without sizing and testing if the primer fires
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