Hard to chamber and sticky bolt lift with empty brass

Cz455guru

Private
PX Member
Minuteman
Oct 13, 2017
100
22
I have a 20 br that has always been Abit hard to chamber I narrowed it down to my brass not being sized down enough with the Redding 20 br dies. So I sent whidden a copy of my reamer print and got a custom die made and that didn't fix the problem. Then I started marking on my brass to see where it was rubbing in the chamber and found out it's rubbing quite hard on the bolt face the area around the primer pocket specifically. Anybody ever see this and know what's causing it. Also how to fix it?
 

Attachments

  • 15738848579163628235709268553522.jpg
    15738848579163628235709268553522.jpg
    382.5 KB · Views: 66

Supersubes

Heathen
PX Member
Minuteman
  • Sep 6, 2006
    5,985
    5,319
    Rural Nevada
    Is that the only place it’s rubbing? How much are you bumping the shoulders? Can you bump them more? Is the whidden a bushing die?

    If it takes a bunch of bump to make them fit, I’d look closely at the radius between the neck shoulder junction as a culprit. I had PT&G send me a reamer with zero radius there(thanks PT&G?). This would cause interference because the sizer left a relatively large radius.
     

    Cz455guru

    Private
    PX Member
    Minuteman
    Oct 13, 2017
    100
    22
    Is that the only place it’s rubbing? How much are you bumping the shoulders? Can you bump them more? Is the whidden a bushing die?

    If it takes a bunch of bump to make them fit, I’d look closely at the radius between the neck shoulder junction as a culprit. I had PT&G send me a reamer with zero radius there(thanks PT&G?). This would cause interference because the sizer left a relatively large radius.
    That is the only spot that I can tell it's rubbing but clearly it is hitting somewhere else to cause that. It is a bushing die. But that is a interesting idea I'll check that out.
     

    Cz455guru

    Private
    PX Member
    Minuteman
    Oct 13, 2017
    100
    22
    That is the only spot that I can tell it's rubbing but clearly it is hitting somewhere else to cause that. It is a bushing die. But that is a interesting idea I'll check that out.
    The die don't allow me to bump anymore I have experimented all the way to about 8thousands bump but it don't change anything.
     

    Supersubes

    Heathen
    PX Member
    Minuteman
  • Sep 6, 2006
    5,985
    5,319
    Rural Nevada
    Look closely for other interference points then. Below is one of my test cases for the chamber i mentioned above. This case has been bumped about .006 but still shows a contact point at the neck shoulder. The other lower rings were from two different size headspace comparators. These cases were fired in another chamber(with a .125 radius), and when I was trying to transition to the new barrel, neither of my dies would remove enough of the radius until i had sizes them a bunch.

    A3E803B1-DF8D-43C1-B6B2-3C4E9064588E.jpeg
     
    Last edited:

    Cz455guru

    Private
    PX Member
    Minuteman
    Oct 13, 2017
    100
    22
    Look closely for other interference points then. Below is one of my test cases for the chamber i mentioned above. This case has been bumped about .006 but still shows a contact point at the neck shoulder. The other lower rings were from two different size headspace comparators. These cases were fired in another chamber(with a .125 radius), and when I was trying to transition to the new barrel, neither of my dies would remove enough of the radius until i had sizes them a bunch.

    View attachment 7184108
    I feel like this is exactly my problem. This brass has been fired from another 20 br barrel. I would get some new brass but I'm afraid with the necking down process I would run into the same issue
     

    E. Bryant

    STABILITRAK ACTIVE
    Supporter
    PX Member
    Minuteman
  • Oct 25, 2010
    3,457
    3,585
    MI
    Maybe this a dumb question, but how is your brass overall length?
     

    PATCO

    Private
    Minuteman
    Jul 13, 2019
    42
    26
    I've had this problem for several different reasons. I am currently sizing for three 6.5 CMs and one of them has to be sized differently to keep it from sticking on the extract and lock-up. They all headspace exactly the same with PT&G go/no-go gages. I can live with this since I hand load all my rounds. The problem is the neck/ shoulder joint. I had a new Ruger RPR that was hanging brass on the extract and hard to lock-up. I finally sent it back to Ruger and they replaced the barrel. Sometimes its just best to swap them out and move on. Some problems are just so finite in nature we may never find them. You said the reamer was custom. Who chambered it and will they try to fix it?
     

    918v

    A force in your life
    PX Member
    Minuteman
    Jul 15, 2007
    4,301
    1,558
    Miserable CA
    The die don't allow me to bump anymore I have experimented all the way to about 8thousands bump but it don't change anything.

    If you had bumped the shoulder .008” then you would not have rub marks on the case bottom.

    Is it a hard stop or a progression of resistance until the bolt closes?

    Did you measure the diameter of the case at the head, shoulder, neck pre and post sizing?
     

    whatsupdoc

    Major Hide Member
    PX Member
    Minuteman
  • Dec 12, 2017
    1,547
    1,684
    I feel like this is exactly my problem. This brass has been fired from another 20 br barrel. I would get some new brass but I'm afraid with the necking down process I would run into the same issue

    Mark your brass from the extractor groove forward about a half inch. The case is too wide you would need like a small base die and I dont believe anyone makes one for that cartridge.