FWIW
Using the Hornady case comparator
The case “headspace” with the .375” bushing
Factory unfired HXP 1972 measures 2.040” av , +\- .002” out of 16 rounds right off the clips
those cases fired in the Dane
2.045” with a +/- .001”
So the brass expands and pushes the neck forward .005” on average.
my lee die is set up to size my brass to 2.040” on average and it chambers in all my rifles.
I dont know if .005” is over working brass enough to bother.
On my “match” rifle I run a hornady die to push my shoulder back just a smidge .002-003” just so I know it will chamber easily.
Using the Hornady case comparator
The case “headspace” with the .375” bushing
Factory unfired HXP 1972 measures 2.040” av , +\- .002” out of 16 rounds right off the clips
those cases fired in the Dane
2.045” with a +/- .001”
So the brass expands and pushes the neck forward .005” on average.
my lee die is set up to size my brass to 2.040” on average and it chambers in all my rifles.
I dont know if .005” is over working brass enough to bother.
On my “match” rifle I run a hornady die to push my shoulder back just a smidge .002-003” just so I know it will chamber easily.
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