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Thread: 7mm Rem Mag sizing problems

  1. #16
    Almost literate. veitnamcam's Avatar
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    Quote Originally Posted by falcon6555 View Post
    Compared to an unfired round the shoulder on the resized brass doesnít seem to be bumped back down enoughAttachment 85164
    Check overall case lenght of resized brass is in spec. You do not want it tight on the mouth of the neck in the chamber!
    It sounds like you jave a largish chamber and when you squeeze that body brass back in it has to go somewhere and it pushes the shoulder forward.Check it is actually tight on the shoulder and if so wind die down an 1/8th of a turn at a time untill the bolt handle just closes with very light pressure.If you cannot get anymore sizeing you may need to grind or machine a touch off of the bottom of the die to let the case enter it further.

    Sent from my SM-A320Y using Tapatalk
    "Hunting and fishing" fucking over licenced firearms owners since ages ago.

  2. #17
    Big or small 6.5 drops em all.
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    The brass has been trimmed to length and is ok it just won’t physically go any further into due. Shop is looking at it but I suspect you’re right and it’s a largish chamber, will see what they come up with

  3. #18
    Member wsm junkie's Avatar
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    Quote Originally Posted by veitnamcam View Post
    Check overall case lenght of resized brass is in spec. You do not want it tight on the mouth of the neck in the chamber!
    It sounds like you jave a largish chamber and when you squeeze that body brass back in it has to go somewhere and it pushes the shoulder forward.Check it is actually tight on the shoulder and if so wind die down an 1/8th of a turn at a time untill the bolt handle just closes with very light pressure.If you cannot get anymore sizeing you may need to grind or machine a touch off of the bottom of the die to let the case enter it further.

    Sent from my SM-A320Y using Tapatalk
    I had this with my AI dies, had 20thou ground off shellholder and was sweet as from then on

  4. #19
    Member Walker's Avatar
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    Thats something to check, have inadventantly used a RCBS shell holder with hornady dies a few years ago and wondered why it wasn't sizing properly.

  5. #20
    Big or small 6.5 drops em all.
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    UPDATE
    Got the dies and cases back from H&F today and it looks like my old Lee case lube was causing the problem. I am now using hornady lube on a case lube tray and it is now sizing all the way down the case and apart from 3 out if 90 they are all chambering easily .
    Case solved and thanks for all the info. The lee lube cane with my original press about 9 years ago and worked fine on my old 6.5 but was no good with the 7mm.

  6. #21
    Big or small 6.5 drops em all.
    Join Date
    Jul 2014
    Location
    Palmerston North
    Posts
    106
    UPDATE
    Got the dies and cases back from H&F today and it looks like my old Lee case lube was causing the problem. I am now using hornady lube on a case lube tray and it is now sizing all the way down the case and apart from 3 out if 90 they are all chambering easily .
    Case solved and thanks for all the info. The lee lube cane with my original press about 9 years ago and worked fine on my old 6.5 but was no good with the 7mm.

 

 

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