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  1. #21
    Advisory Panel Patrick Chadwick's Avatar
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    Quote Originally Posted by browningautorifleicon View Post
    ...still sounds like an overall length thing, bullet in LEAD or commencement... t...
    Hallo Ovidio, I agree with Jim. It is not sufficient to rely on OAL for really precise bullet seating. Variations in the ogival curve between different types and (on the sub-tenths of a mm level) maybe even between batches of the same bullet will affect the precise seating depth at which the bullet contacts the transition cone a.k.a. throat.

    I suggest that you take a couple of your reloads, ink over the contact area with a felt pen, and load/unload them in the rifle by hand. If there is any marking of the inked area, then you know that your bullets are touching the lands. All mechanical processes - bullet manufacture and bullet seating - have tolerances, and if the bullets are too close to the lands (which in my view is anything under 1/10 mm) then some will be touching, some will be free, and the variations in pressure will affect the grouping.

    My guess is that if you seat the bullets to be at least 0.25mm off the lands performance will be improved.

    Give it a try!
    Patrick
    Last edited by Patrick Chadwick; 01-16-2020 at 05:10 AM. Reason: typos

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  4. #22
    Advisory Panel browningautorifle's Avatar
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    Quote Originally Posted by Patrick Chadwick View Post
    I suggest that you take a couple of your reloads, ink over the contact area with a felt pen, and load/unload them in the rifle by hand.
    Yep...that's what I'm thinking too. You will likely feel them touching the commencement anyway, they'll stop hard before they should. Too, bullets that touch the commencement have a higher pressure at firing...so I understand.

    By the way, I think it's leade not lead at the commencement...someone will correct me I'm sure...
    Regards, Jim

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  7. #23
    Contributing Member Ovidio's Avatar
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    Thanks guys.
    I’ve been in Germanyicon the whole week and will be back home tomorrow evening.
    All the time with that thought nagging at me. I really want to understand what happened.
    But Saturday, after showing the company to a few Austrian customers, I’ll go with my heir to the range with our old Carcano and the Persian Mauser. Fass will be nect week again.
    But I’ll update you.
    34a cp., btg. Susa, 3° rgt. Alpini

  8. #24
    Contributing Member Ovidio's Avatar
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    Finally I remembered to take pictures of the infamous round that got stuck.
    It is not dented at the shoulder, so it really got blocked before completely chambering.
    The striker touched the primer with some authority, not enough to get it going, luckily.


    34a cp., btg. Susa, 3° rgt. Alpini

  9. #25
    Advisory Panel browningautorifle's Avatar
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    Can't help but say it has to be too long. The mechanics speak for themselves. It needs to be shorter so the bullet doesn't touch commencement. The shoulders of the case don't look sharp either, like this hasn't been sized...but I can see your trim marks at the mouth.
    Regards, Jim

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  11. #26
    Contributing Member Ovidio's Avatar
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    Fact is, I sized, trimmed and chamfered each round. Then I use a manual scale and also put the powder manually in each and every round.
    After seating the bullet, I measure again each and every round, allowing a maximum of 1/10th of a mm of tolerance.
    That's the reason I decided to put everything aside and keep shooting with the Mauser.
    I really could not understand how a problem like that could have occurred.
    And, sincerely speaking, I still don't get it.
    The shoulders have just touched the chamber. It can be seen, but it is miles away from the way the other cases look like after being simply chambered, let alone fired.
    Someday I'll take her out again and fire the commercial S&B rounds. They have the exact same length of mine, but the brass is new.
    Let's see...
    Luckily I don't fret about semiautos.
    34a cp., btg. Susa, 3° rgt. Alpini

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  13. #27
    Contributing Member Ovidio's Avatar
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    I got the field manual of the Fass57 from a Swissicon guy who writes on our Italianicon Milsurps Forum.
    Interesting.
    I also found the complete Germanicon manual.

    Now you guys have an excuse to start learning Dante's magnificent language. And Goethe's!



    Stgw57-Handbuch.pdf
    Last edited by Ovidio; 01-22-2020 at 12:25 PM. Reason: Typo
    34a cp., btg. Susa, 3° rgt. Alpini

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