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Rest in Peace
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It's not unusual for M1A brass to be too long to go back into the chamber it just came out of. That's because the bolt starts twisting and yanking on it before the pressure has fully gone away and allowed the brass to let go of the chamber walls. You end up with not enough headspace to re-chamber the case - the base to shoulder measurement on the brass is longer than the bolt face to shoulder measurement of the chamber. This is also the reason the M1A eats brass faster than just about any other gun.

The brass must be f-l resized before it can be used again.
 
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