Originally Posted by Edd
There is a base to shoulder datum spec for a 7mm STW chamber and other belted case chambers. For the STW the minimum is 2.4697" and the maximum is 2.4797". That is measured at a shoulder diameter of .420".
Read my post again, I made no mention of the CHAMBER datum, only the dimensions of the BRASS, which are NOT held to these or any other dimension, if they were, they would all measure the same from every manufacturer, which they DON'T.