dellet
Gold $$ Contributor
Chamber length and neck length are two different measurements.
The Sinclair tool allows you to measure maximum length and then calculate neck length.
The difference between chamber length, bolt face to end of chamber
And neck length, shoulder datum to end of chamber are co dependent.
Max length of 2.100” is almost meaningless. For a ridiculous example, a case with the shoulder datum set at 1.500” that is still 2.100 long has neck .600” long and in theory needs trimming of .010” to be “in spec”.
A chamber cut to minimum headspace, maximum overall length can accommodate a case with about .020” longer neck than a chamber cut to maximum headspace, minimum overall length.
Headspace, case base to shoulder datum placement determines neck length, overall length is adjusted accordingly to determine the clearance between the neck and end of chamber.
I would probably trim for uniformity, and again if the neck grew to less than .010” clearance to end of the chamber.
The Sinclair tool allows you to measure maximum length and then calculate neck length.
The difference between chamber length, bolt face to end of chamber
And neck length, shoulder datum to end of chamber are co dependent.
Max length of 2.100” is almost meaningless. For a ridiculous example, a case with the shoulder datum set at 1.500” that is still 2.100 long has neck .600” long and in theory needs trimming of .010” to be “in spec”.
A chamber cut to minimum headspace, maximum overall length can accommodate a case with about .020” longer neck than a chamber cut to maximum headspace, minimum overall length.
Headspace, case base to shoulder datum placement determines neck length, overall length is adjusted accordingly to determine the clearance between the neck and end of chamber.
I would probably trim for uniformity, and again if the neck grew to less than .010” clearance to end of the chamber.
