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This 'break in' procedure

Discussion in 'Mossberg 590 Pump Action' started by Shadowdog, May 25, 2020.

  1. Shadowdog

    Shadowdog .22LR

    Messages:
    16
    I had the 590A1 lock up with a round chambered and got great advice here, but it's not over.
    I followed the advice in this thread: http://www.mossbergowners.com/forum/index.php?threads/improved-mossberg-elevator.12594/#post-166999
    but I did minimal filing as instructed.
    When I loaded the mag tube again with high brass Rio 00 buck, as before, it resisted going in the tube. And again, the action lock lever hung up and jammed everything again. But this time, by swearing and trying to pull the lever back down while pushing the forearm forward it freed itself and I was able to cycle several rounds thru it and unload.
    Then I tried Rio #8 game loads (low brass) and they insert easily in the mag tube and cycle and eject perfectly. So, is the high brass thicker? It seems so.
    I know most every firearm prefers a particular brand of ammo. But where I live there aren't a lot of choices.
    There was a skeet range near here but I don't think it's open anymore. We get a 2 month dove season and while I can take a few shots here and there I really can't fire off 2-300 rounds...
    Is there any way I can break in this 590 other than that? I could try going back and doing a little more filing but would rather not.
    At times I miss the wide open spaces of the Pacific Northwest where I could shoot all day.
    meanstreak likes this.
  2. Ernst

    Ernst .270 WIN Supporter "Philanthropist"

    Messages:
    354
    Have you compared the breech face diameter of the two shell your using. Might hold them "butt to butt" to see if there is any difference in diameter. May need a micrometer. From your description of the loading problem sound like diameters might be different. Have you tried a different brand of 00 buck?

    Assume both these shells are the same length or is one 2 3/4 and other one 3 inches? Some folks have a harder time loading longer shells.

    Regards
    meanstreak likes this.
  3. Shadowdog

    Shadowdog .22LR

    Messages:
    16
    The #8 shot shell is 2&1/4" and the 00 is 2&1/2" long. Don't have a micrometer. But asap I'll get to the gun shop and see what other brands they have, When I bought these, if I recall, it was the only brand they carried. Can't just go to any sporting goods store and pick up ammo here. The wonders of gov.!
    Come Sept. and Oct. I'll be doing some shootin'.
    meanstreak likes this.

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