Results 1 to 7 of 7

Thread: powder lot variation wt VS volume

  1. #1
    Join Date
    Dec 2003
    Location
    washington.........STATE that is.
    Posts
    9,921

    powder lot variation wt VS volume

    So I will sometimes see where a guy will comment "this powder varies wildly from lot to lot."

    While another fellow will comment "I've found this powder to be consistent lot-to-lot."

    I weigh everything, then set clicks to my wt.

    Many folks I know never weigh PPC powders... volume only.

    Has anyone noticed powder varying BY VOLUME from lot to lot but being consistent BY WEIGHT?

    Or vice versa?

  2. #2
    Join Date
    Dec 2017
    Posts
    466
    yes
    IMHO
    several powders produce the same energy
    at a given volume, tho the weight may vary a little.

    and then the guys that say to let new powder "breathe"
    like a fine wine, and then work with it. let that new smell go away.

  3. #3
    Join Date
    Feb 2003
    Location
    Down By the Cedar River
    Posts
    1,074

    In Iowa

    By weight Al.

  4. #4
    Join Date
    Nov 2007
    Location
    La Belle Province
    Posts
    151

    Lot to Lot: To Measure is to know.

    I think itís more of a trial an error thing where you see which way works best and if you are set on only weighing or metering you may be leaving something on the table.
    I love theory but when it comes to NC load development I think testing is a better option. NC chemical and physical properties are interlinked and variable. Its mass Energy content (nitrogen) is directly related to its solid density which is measured by weight per unit of volume but its Energy content by volume is complex and has to do more with things like chemical composition, structure make-up, surface treatment, grain dimensions and Load Density; to name a few.

    BR

    Ken

  5. #5
    Join Date
    Apr 2011
    Location
    Peoples Republic of California
    Posts
    61
    Quote Originally Posted by K Hope View Post
    I think itís more of a trial an error thing where you see which way works best and if you are set on only weighing or metering you may be leaving something on the table.
    I love theory but when it comes to NC load development I think testing is a better option. NC chemical and physical properties are interlinked and variable. Its mass Energy content (nitrogen) is directly related to its solid density which is measured by weight per unit of volume but its Energy content by volume is complex and has to do more with things like chemical composition, structure make-up, surface treatment, grain dimensions and Load Density; to name a few.

    BR

    Ken
    And that is your mic drop!
    Concise, accurate and points out the fact that none of us (well most of us) don't have the type of equipment to actually know the difference. So all we can do is ask the gun.
    Just as an aside Lot 6 of LT32 on my Harrel measure weighs 28.35 (avg) vs Lot 10 @ 28.2 (avg) same setting.
    Since I weigh all my charges it doesn't matter to me but to get the same velocity I had to be at the same weight.
    (more volume).
    JMHO
    Greg

  6. #6
    Join Date
    Dec 2017
    Posts
    466
    i think this is common
    over the counter powders can only vary so much
    ALL LOAD DATA IS PUBLISHED IN WEIGHTS.
    the same weight the same vel, tho it may be more or less vol of powder.
    volume is what br shooters see change,
    do not know how many weigh to see if the vol change is actually the same weight.

    Quote Originally Posted by wfcustom View Post
    And that is your mic drop!
    Concise, accurate and points out the fact that none of us (well most of us) don't have the type of equipment to actually know the difference. So all we can do is ask the gun.
    Just as an aside Lot 6 of LT32 on my Harrel measure weighs 28.35 (avg) vs Lot 10 @ 28.2 (avg) same setting.
    Since I weigh all my charges it doesn't matter to me but to get the same velocity I had to be at the same weight.
    (more volume).
    JMHO
    Greg

  7. #7
    Join Date
    Feb 2003
    Location
    Tennessee
    Posts
    5,096
    "So all we can do is ask the gun"

    Simple and so very true!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •