Big problem with my brass need help!

Discussion in 'Reloading' started by elmerdeer, Oct 17, 2008.

  1. elmerdeer

    elmerdeer Well-Known Member

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    I just finished resizing my brass with a lee collet necksizer and found groove marks on my belts on the 7mm mag nosler brass, some of the groove marks are way more evident than others, meaning you can see and feel them with your finger much more. They metal snags on my finger a bit from how rough they are. This was the 4th time they were fired, I annealed them on the 3rd. When I was at the range the temp was 75 degrees. My load is 70grs of RL-25 with a 160 accubond my avg speed is 3077. I have shot this load over 300 times with out a problem like this, but maybe not at 75 degrees, but I have shot it at 70 degrees many times with out a problem.My measurement on the belt is .530" it seems fine compared to my twice and 3 times fired brass. Now has anyone seen these marks before and what caused them I am stumped? That day I fired 30 rnds 6rnds per target on of my targets was a .860" for 6 shots in a gusty day, the rest were average between 1.5-2 inch groups.
    Thanks
    elmer
     
  2. MagMan

    MagMan Well-Known Member

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    By chance was this the first time they were fed from the magazine?

    I think a picture would add more insight to your problem.
     

  3. elmerdeer

    elmerdeer Well-Known Member

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    I cant get the picture to load. Single fed them.
    Elmer
     
  4. MagMan

    MagMan Well-Known Member

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  5. elmerdeer

    elmerdeer Well-Known Member

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  6. MagMan

    MagMan Well-Known Member

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    [​IMG]

    I'm not sure what that is all about. Surely you wouldn't think the back of your chamber was that rough.

    It can take up to 3, 4 or even more firings for brass to fully expand. I'd make sure its clean in there and maybe drag a qtip around to see if it is as rough as it looks then perhaps a plastic pick to get all of the stuck brass shavings out.
     
  7. Winchester 69

    Winchester 69 Well-Known Member

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    Did the Lee collet die do the damage? Any chance that it's a 280 die?
     
    Last edited: Oct 17, 2008
  8. KRP

    KRP Well-Known Member

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    Shouldn't matter, all the Lee collets are ~.532 inside.

    I think the belt is slightly oversized or the die is slightly undersized and causing the problem or maybe the bottom of the collet has some crap/burrs on it. Turn a case around backward and see if the head will slide easily into the collet. If not clean the die well, then maybe hone the bottom inside of the collet a little to clean it up and make it smooth.
     
  9. kraky2

    kraky2 Well-Known Member

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    belted mag...can't be a 280...no belt on 280.
     
  10. elmerdeer

    elmerdeer Well-Known Member

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    Its a 7mm rem.