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“The brass will stretch and that's why you check OAL before reloading and trim if necessary”
true, the OAL is determined after the case is loaded and the bullet is seated, before AOL is case length, the case has a maximum case length, the case has a trim to length, the case length is not part of the OAL (case overall length as in an included length, the length includes the case and bullet). “trim if necessary” is determined by the length of the case.
The OAL is determined by measuring the length of the case with the bullet seated from the tip of the bullet to the head of the case.
It is possible to measure the length of the chamber from the beginning of the throat back to the bolt face. Anyone with forming die can form cases and trim to length for testing the length of the chamber. When forming the cases pushing the shoulder of the case ‘too far’ is key,
F. Guffey
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