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Thread: Help needed with case chambering problems

  1. #1

    Help needed with case chambering problems

    Reloading 6.5x47L, case length 1.840", OAL 2.631" at the Ogive 2.096". All Full length resized, CCI primer, 38.0gr N140, SAAMI spec chamber. Forster Bench Rest Die's. RCBS Rockchucker Supreme press. I think that covers the techy bits.

    Here's the rub:

    New cases fired with no feeding problems or bolt closing problems at all.
    Once fired I started to notice a few where the bolt was anything from slightly tight to tight,
    Twice fired, most were very tight to impossible to close the bolt
    Between each firing they were all FL resized.

    I then tried some already FL resized cases, which again a lot were tight, I resized them again and then just tried chambering the cases to discount the bullet seating depth being a problem. No change they were still tight to very tight.
    To discount problems with the press I put the Die in my old JR3 press and again resized and again no difference. If the case it tight to start, the resizing makes no difference.

    All the unfired cases I have whatever length chamber effortlessly, even when loaded to above specs.

    One observation that may or may not be of significance. I use an L E Wilson trimmer and it is superb at its job, very accurate. I have noticed however that a new unfired case sits much further into the shell holder than a once fired FL resized one.

    I hope this makes some sense as I am not great on the keyboard, I think I have covered most things, so, reloading Gents and Ladies (if present) of many years experience, can I please have your thoughts on this problem, Chamber, Die or something else ??

    Cheers

  2. #2
    Try sizing a case with the sizing button present and try it in your chamber.
    Its possible that as the sizing button is exiting the neck, it is dragging the neck slightly and stretching the shoulder.

    Ian.

  3. #3
    Quote Originally Posted by Whitebeard View Post
    Try sizing a case with the sizing button present and try it in your chamber.
    Its possible that as the sizing button is exiting the neck, it is dragging the neck slightly and stretching the shoulder.

    Ian.
    I think Ian means 'without' the neck expander button present i.e. remove it ? I was discussing expander buttons with enfieldspares the other day and he advised that dipping the case mouth in graphite could remedy excessive drag on the neck by the expander button.

  4. #4
    I have seen this problem with a friend using the cartridge & he ended up backing out the F/L die a little..seemed as though the shoulder was being pushed out of spec very slightly causing the chambering issue. Hope this helps. ATB
    Blaser K95 Luxus Kipplaufbüchse .25-06Rem. Zeiss 8x56, 110gn Nosler Accubond = Game Over!

  5. #5
    Quote Originally Posted by Uncle Norm View Post
    I think Ian means 'without' the neck expander button present i.e. remove it ? I was discussing expander buttons with enfieldspares the other day and he advised that dipping the case mouth in graphite could remedy excessive drag on the neck by the expander button.
    No worries, I understood what Ian meant anyway, I have just tried it but it made no difference at all. Baffling stuff

  6. #6
    Quote Originally Posted by deeangeo View Post
    I have seen this problem with a friend using the cartridge & he ended up backing out the F/L die a little..seemed as though the shoulder was being pushed out of spec very slightly causing the chambering issue. Hope this helps. ATB
    I've seen this myself in a set of 6.5x55 dies.~Muir

  7. #7
    Quote Originally Posted by deeangeo View Post
    I have seen this problem with a friend using the cartridge & he ended up backing out the F/L die a little..seemed as though the shoulder was being pushed out of spec very slightly causing the chambering issue. Hope this helps. ATB
    Makes sense, I guess that would mean that the non chambering ones are a loss. Surely that's a fault with the Die, I have set it up exactly as specified in the instructions, either way it brings things to a halt for now, no point ruining any more.

  8. #8
    Mutley,
    Just to eliminate a set of variables, have you tried a fired case in the chamber before sizing?. That is, put an empty back in the chamber. If it goes in and out ok then it's not the chamber.
    The other thing to try is to take a resized case - one that is tight in the chamber and cover it all over with black marker. Put that into the chamber and note where the blackening has rubbed off. This may indicate where the problem lies.
    The suggestion made by Deeango in Post #4 could be the answer and this might be indicated by the black marker method as above.
    Whatever you do, please let us know the outcome.
    Peter

  9. #9
    Quote Originally Posted by PeteL View Post
    Mutley,
    Just to eliminate a set of variables, have you tried a fired case in the chamber before sizing?. That is, put an empty back in the chamber. If it goes in and out ok then it's not the chamber.
    The other thing to try is to take a resized case - one that is tight in the chamber and cover it all over with black marker. Put that into the chamber and note where the blackening has rubbed off. This may indicate where the problem lies.
    The suggestion made by Deeango in Post #4 could be the answer and this might be indicated by the black marker method as above.
    Whatever you do, please let us know the outcome.
    Peter
    I think this is a wholly pointless exercise. IMHO a new case fired in a given chamber will re-chamber in the same rifle.

    I suggest checking the case OAL after the first (futile) resizing. If the OAL isn't excessive, then it's the Forster Dies (shock horror for their fans) so change your dies to Redding, or another make . It sounds like the diameter of the base section isn't being squeezed down sufficiently. If the shoulder isn't being resized enough (backing out the die can only make this effect more pronounced ......???!) then the reloaded round will seize up much earlier during it's partial travel.

    Excessive drag on the neck may lengthen the neck, but shouldn't change the acuteness of the shoulder angle enough to thwart the camming action of a bolt action to chamber the case successfully.

    This is a very new calibre. I think there are bound to be dimensional differences between different brands of reloading dies.
    Last edited by Sinistral; 02-03-2014 at 12:03.
    If I'm going to be accused of it then it's just as well I did it.

  10. #10
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    Forster dies are supposed, as you know, to be screwed down until they contact the shellholder so as to full length size. They can then be fine tuned by backing them off slightly until the shoulder is just set back that small amount so that you have minimal headspace.

    I agree with PETER L abount trying to re-chamber a once fired case that has not been sized. I don't think it is pointless as it may show up a chamber that has not been drilled, or has become so, "true". In other words with a bulge in one orientation.

    Oddly, too, as MUIR says, backing OUT the sizing die may also solve the problem. In that if the chamber has been cut long than with the sizer die screwed right down hard against the shellholder it may in fact make the shoulder wider.

    But you have to eliminate all possibilities and trying a fired case, as PETER L suggests, will at least show that the chamber is cut "true" and/or that you don't have a bulge in one side of it. So try that unfired case at 6, and 12, o'clock orientations.

    If you have engineer's blue it may help to try chambering a sized case and see if that blue is rubbed off anywhere.

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