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Thread: Oal consistency

  1. #1

    Oal consistency

    Can any one help?
    been reloading some .243 rounds today and I am finding that the oal consistency is not very good
    i have just invested in a hornaday oal gauge and comparator and I am getting a difference in oal measurement of about 5-6 thou between rounds, some are the right measurement some are 6 thou over and some in between
    I am using a lee press and dies
    all case are prepped the same, length, chamfered,cleaned, neck sized etc
    tried re-stetting dies in press several times and no difference
    or is it just the quality of lee reloading gear?
    Anyone got any ideas?
    cheers
    ps. using Sierra bullet and lapua fire formed brass

  2. #2
    What scierra bullets?
    what is the variation on the bullet OAL from base to comparator ogive?

    think you will be shocked by the results!

    have you actually fired them with this variation?

  3. #3
    hi bewsher

    85 grain spitzer bullets

    variation from bullet base to comparator (ogive) is between 6-0 thou

    yes been firing them like that for a while, just bought the measuring tools and it showed up the variations

    accuracy ok was just trying to improve it!

  4. #4
    Quote Originally Posted by Steve Sykes View Post
    I am getting a difference in oal measurement of 0-6 thou between rounds,
    (some are the right measurement some are 6 thou over and some in between)

    Quote Originally Posted by Steve Sykes View Post
    hi bewsher
    85 grain spitzer bullets, variation from bullet base to comparator (ogive) is 0-6 thou
    Ain't never going to get that number down when the key component demonstrates the variance


    Quote Originally Posted by Steve Sykes View Post
    accuracy ok
    then stop measuring or buy better bullets!

  5. #5
    miss understood
    base of bullet case to ogive is 0-6 thou variation
    actual bullet variation over ten measured is less than 1 thou

  6. #6
    If they shoot well then hurt your brain about something else...
    Less than 1 thou var is nothing.

  7. #7
    Try measuring some factory ammo . . . you might not be so fussy after that!

    The lead tip of soft point bullets are not uniform and from the end of the jacket to the tip vary and will account for the different OAL readings. Measuring from the base to the ogive . . . how accurate are you at measuring to within a few thou? Having used a Lee for years and not bothered greatly up to 10 thou difference in OAL using Sierra and Hornady bullets, I still get accurate rounds to produce 1/4" groups with the optimum bullet for that calibre!

    What are your results anyway and should you be concerned?

  8. #8
    I found a week or so ago my 142gr smk loads varied up to 9.5 fow using the comparator, thought my calipers had gone wrong, after a few checks it was obvious calipers worked fine, I measured from base of the bullet to ogive and found they varied up to 9.5 fow, checked some 140gr amaxs and they varied half as much, tried some berger vlds varied half as much again

  9. #9
    The seating die does not (cannot) press on the bullet exactly at the same place on the ogive as a comparator (it would dig in). It will be closer to the bullet tip.

    So even if the seating process is absolutely uniform, when you measure it with a comparator any inconsistency in bullet manufacture will look like a variation.

    I was concerned about this, so tried removing the seating plug from my die, and using that instead of the comparator.

    All the rounds were within a couple of thou.

    Thats why I despair when newbie reloaders insist on trying to seat their bullets within single digit figures from the lands.

  10. #10
    SS are you happy that your primers are seated well below the level of the headstamp?

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