To prove me wrong you mark the bolthead, you close the bolt while pulling the trigger and thrusting the bolt forward. I concede. You got me.
I somehow missed that closing the bolt on an empty chamber while pulling the trigger demonstrated your problem. Close the bolt like you would normally and there is no end play.
I don't find the of closing the bolt while holding down the trigger to be used in troubleshooting any known issue that I am aware of. If there is "end play" between the bolt head and the breech in the uncocked position, there is no reason to machine your barrel.
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