.308 winchester: best value way of checking headspace and case length while reloading

want2learn

Private
Full Member
Minuteman
Sep 7, 2013
1,257
494
Hi, I'm starting to shoot at longer distances and making progress in my reloading. Finally got a good load for my Tikka but still a long ways away for my Sig.

In an effort to produce safe, accurate & reproducible loads i've noted so many options to measure headspace and case length.... but cost is a real factor.

Wondering what people prefer to check headspace and case length.

Not really sure which method/tool is currently felt to be most appropriate.

thanks
 

TheGerman

Oberleutnant
Full Member
Minuteman
  • Jan 25, 2010
    10,191
    28,066
    the Westside

    want2learn

    Private
    Full Member
    Minuteman
    Sep 7, 2013
    1,257
    494
    918V, could you perhaps explain how you utilize a .40 case to check headspace and case length. i'd appreciate it, just not familiar with the process/concept.
     

    spife7980

    Luchador
    Full Member
    Minuteman
    Feb 10, 2017
    11,204
    11,412
    Central TX
    The gauge for many cases is a .40 datum diameter and an empty 40 s&w case is pretty much that so you just use the brass in place of the actual hornady piece with calipers. It won't work for everything but it will on a fair number of things.
     

    918v

    It’s not the primer!
    Full Member
    Minuteman
    Jul 15, 2007
    5,728
    2,992
    Miserable CA
    Put a 40 case mouth over the neck of a 308 and it will bottom out against the shoulder. Put the caliper jaws on the caseheads of the respective cases and measure the shoulder length. Subtract the length of the 40 case to give you the actual number. Set your sizing die to bump the shoulder .002"

    You don't need fancy comparators to to that.
     

    Rob01

    Cool Moderator
    Staff member
    Moderator
    Full Member
    Minuteman
    Jul 9, 2001
    13,178
    6,411
    NC
    If you are going to be loading for the long run then spend the money and get the right tools for the job. Might not have to do it now but having the right tools to keep proper measurement data is very useful.

    For headspace
    https://www.midwayusa.com/product/4...headspace-gauge-5-bushing-set-with-comparator

    or

    https://www.midwayusa.com/product/574297/rcbs-precision-mic-308-winchester

    For OAL to ogive
    https://www.midwayusa.com/product/746974/ptg-bullet-comparator-22-24-25-26-28-30-calibers

    or

    https://www.midwayusa.com/product/2...ad-bullet-comparator-basic-set-with-6-inserts

    If you do use a .40 piece of brass make sure to mark it and use the same one every time as using different ones will give you different measurements.