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Thread: Rounds jamming into lands

  1. #61
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    Apr 2012
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    Kingcountry
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    When I FLR a belted case, wind the die back 3 or 4 turns, then resize and slowly wind forward and resize again until the bolt closes with slight resistance.
    veitnamcam, mikee, zimmer and 2 others like this.

  2. #62
    Member
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    Feb 2015
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    BUsh
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    It appears the first pic posted has the projectile seated longer than subsequent pics so probably there is no issue with the shorter ones being too long. Best to do a process of elimination by first stripping the bolt of all load and chambering loaded rounds without using the magazine......find the tight ones and pull the projectiles, then check the empty case for tightness. If it is not tight then it can only be the projectile being too tight in the freebore from fouling, binding on the neck due to carbon or debris or some inconsistency in the projectile being damaged.

    If the case is tight it could be many other factors such as trim length too long, case length at shoulder or improper full length sizing as many have already suggested here. You need comparators to check the difference between the tight and not so tight.......hope you get it sorted.....it can be frustrating......!
    bunji likes this.

  3. #63
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    Jan 2018
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    Otorohanga
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    Quote Originally Posted by T.FOYE View Post
    What i see is the lack of cut marks. I think you have a carbon ring that has formed in your chamber throat. When i deliberately extend my projectile fwd i always see little razor like cuts which i dont see in your picks. You are seating way back so i dont think you are hitting the lands at all. I would have that bore inspected / cleaned by a gunsmith

    The other thing is that your plastic tip is deformed. That has happened because the seating stem you are using is not the correct profile for the VLDs you are using. If you're using a redding you can just buy the seater stem upgrade for your existing die. Even better get a Forster die.
    Is the cut mark on my first pic what you are referring to? Or something different again



    Rounds were all single fed. I sorted through all the brass by length and took all the trimmers out and used the brass that havnt needed trimming(anything over 1 thou).

    So I've gathered that the main suspect is the Neck sizing stretching the neck and shoulder but I'm concerned what the cut is on the pill in my first photo as some have stated it's definitely not from the lands. I know that it lefr the same cut on the couple of rounds that were tight that I shot right before.
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  4. #64
    Member
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    Dec 2019
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    Okawa Hawkes Bay
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    1,606
    Quote Originally Posted by kayneb View Post
    Is the cut mark on my first pic what you are referring to? Or something different again



    Rounds were all single fed. I sorted through all the brass by length and took all the trimmers out and used the brass that havnt needed trimming(anything over 1 thou).

    So I've gathered that the main suspect is the Neck sizing stretching the neck and shoulder but I'm concerned what the cut is on the pill in my first photo as some have stated it's definitely not from the lands. I know that it lefr the same cut on the couple of rounds that were tight that I shot right before.
    Attachment 178652
    Greetings again kayneb,
    I saved the image and zoomed in to get a better look. There are no scrape marks on the forward side of the gouge. This and the fact you had other rounds with this mark leads me to believe that the gouge did not happen in the chamber. My guess would be that the ejector, Plunger type I assume, drove the cartridge into a rough spot inside the action. A careful feel around inside the front of the ejection port may turn something up. A rough edge would do it.
    Regards Grandpamac.
    Borris likes this.

  5. #65
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    May 2012
    Location
    Sydney
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    833
    Quote Originally Posted by tetawa View Post
    When I FLR a belted case, wind the die back 3 or 4 turns, then resize and slowly wind forward and resize again until the bolt closes with slight resistance.
    Correct, this is what you should do to set the fls die for your individual rifle.
    grandpamac and Borris like this.

 

 

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