OP stated they he has 22-250 AI headspace gauges so this would not apply I would hope the gauges are in fact to specificationsWhen doing an Ackley chamber. Your go gauge becomes the No-Go gauge!
The distance from the bolt face to the neck shoulder junction It shows on the print you posted. 1.644 AI vs1.664 for the standardThanks all will not be able to see a real gunsmith for a couple weeks.
But I am still confused what part of the AI chamber is shorter sorry to waste your time.
Thanks