When fired it forms to the chamber perfectly, then you remove it reload it & try to rechamber it in a "inspec" chamber which in fact has tolerences & these tolerences no matter how small will cause fit issues .
Now if you indexed the cases so they could be inserted into the chamber in the same orientation may help , but still considering the neck sizing process & seating the bullet will still cause problems .
I personally try for .005 shoulder set back with a FL sizer to insure no troubles .
You may also benefit from checking to see how each step of your process affects the case by trying to chamber 10 cases after each step & maybe change the process abit to aleviate moving brass the wrong way .
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GP100man
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