Got my new Criterion 6mmBR 8tw headspaced this evening and did some measuring.

If anyone sees something that doesn't seem right, jump in and let me know.

Using a Hornady Lock-n-Load OAL gauge I got these results.

Berger 105VLD 2.427"
Sierra 107 2.390"
A-Max 105 2.324"
A-max 87 2.262"
A-Max 75 2.203"

I am using NEW paper box Lapua brass that the OAL is 1.556". Using the above measurements this would mean that:

A-Max 105 had .456" in the case (bullet lenght 1.224" )
Sierra 107 had .401" in the case (bullet lenght 1.235")
Berger 105VLD had .363" in the case (bullet lenght 1.234")
A-Max 87 had .334" in the case (bullet lenght 1.040")
A-Max 75 had .290 in the case (bullet lenght .937")

Using a Sinclair chamber lenght gauge it measured 1.578" and the measurement to the lands with a Berger 105VLD was 1.668"
To the lands= 1.668"
Chamber lenght= 1.578"
Freebore = .090

Old paper box Lapua brass has the shoulder .003" farther forward then the new Blue box I have. Measurement to shoulder 1.068" old brass / 1.065" new brass. Which leaves the new Blue box brass .003 shorter in OAL then the old brass. This was measured in a Hornady head space gauge using Sinclair SS inserts. OAL old 1.556 OAL new Blue box .1553