Measuring case head expansion for pressure signs !

Discussion in '6BR, 6BR Improved & Wildcats' started by SavageMark, Mar 18, 2019.

  1. SavageMark

    SavageMark

    Joined:
    Mar 12, 2019
    Messages:
    152
    Ok ! So I’ve got 5 each loaded 29.0 to 30.0 in .2 increments of Varget for a ladder test. Should I go higher ? And I don’t have an ejector so is it accurate to measure pressure by case head expansion ? I’ve got a set of .0001 digital micrometers to use . Im a little nervous here !!!

    Thx

    Mark
     
  2. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,213
    CE27F5A8-9EE2-4479-87E5-1F0620EF8E63.jpeg One of each is sufficient, I stop at 30.2
    Just watch your primers and note your bolt lift
     
  3. SavageMark

    SavageMark

    Joined:
    Mar 12, 2019
    Messages:
    152
    So am I right In saying your Node is 30.1 ?
     
    gunsandgunsmithing and SPJ like this.
  4. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,213
    That’s correct
     
    gunsandgunsmithing likes this.
  5. SavageMark

    SavageMark

    Joined:
    Mar 12, 2019
    Messages:
    152
    Excuse my ignorance , but why aren’t 4 and 5 closer horizontally ??? Shouldn’t they be closer , or no ??

    Thx
     
  6. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,213
    It just bees that way sometimes :cool:
    Just gotta read the target , they don’t always look like that.
    Sometimes they’ll fool ya.
    There is a thread called- just for Drill pick a Node on the 6 Br page, where the high node was hiding
    J
     
  7. divingin

    divingin Gold $$ Contributor

    Joined:
    Jan 17, 2017
    Messages:
    290
    2 nodes, one at +/-29.7, the other at +/-30.1?

    Those sound kinda close together to me.
     
  8. MihiT

    MihiT

    Joined:
    Mar 12, 2019
    Messages:
    66
    @SPJ, What were the velos?
    ... And where's the other 10 shots? :p I like data, lots of data.
    I will usually take the CW range I want to cover and divide by 10 or 15 (or even 20 if it's quite a few grains difference) for my steps. Would be interesting to see if your results still look the same going .1gn.
    @divingin, some barrels are really not too fussy. Thems the barrels ya wants.
    Also @OP, why 5 of each??
     
    SPJ likes this.
  9. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,213
    29.7 actually shot pretty good it’s just a wee bit tighter at 30.1
     
  10. SPJ

    SPJ Silver $$ Contributor

    Joined:
    Feb 17, 2018
    Messages:
    4,213
    Volocities are around 2850 fps
    Only thing I care about is small:)
     

Share This Page