SAAMI Standards- Head to Datum
1.5613" minimum chamber VS 1.5645" maximum factory ammo. Bolt has to size brass/push shoulder back in the chamber on loading by .0032" Most dies may not size to the minimum.
From Lee's website-
Our full length sizing dies are cut to size the case closer to the middle of the SAAMI dimension, because that is where most rifle's chambers are made, and to size to the minimum would shorten case life.
Last edited by 243winxb; December 6, 2012 at 02:49 PM.