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Final crimp Mec Jr-20 Ga

Discussion in 'Shooting Related Threads' started by Leo, Dec 2, 2010.

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  1. Leo

    Leo Well-Known Member

    Joined:
    Jan 29, 1998
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    Are the hulls buckling about 1/2 inch higher than the brass? Does you MEC have plastic dies or the older steel ones?
     
  2. Shady Creek

    Shady Creek TS Member

    Joined:
    Feb 5, 2006
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    Description of the problem might help..........GOOD LUCK
     
  3. gun1357

    gun1357 Active Member

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    Jun 30, 2006
    Messages:
    927
    My first guess is you are trying to put 6 pounds in a five pound sack. The first thing I would try is a shorter wad. Second would be more wad seating pressure to collapse the wad more. If the shot column is under high pressure in the final crimp, the friction forces the shell tube to buckle. Ron
     
  4. txkpistol

    txkpistol TS Member

    Joined:
    Feb 9, 2010
    Messages:
    58
    I'm having a bitch of a time with my RCBS Grand and older 20g HS AA hulls. I push the wad in as deap and hard as I can (using AA clones wads). It helps some. Ugly crimp but they shoot. The best so far is I've backed off a 1/2 grain of powder. That seems to have helped the most. I reloaded two new boxes of HS AA hulls that I bought and shot. They crimp almost as good as the factory crimp. If all the new HS AA load as well as these two new boxes and clone wads I'm using all will be well.

    m
     
  5. Bill Hom

    Bill Hom TS Supporters TS Supporters

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    Mar 4, 2007
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    965
    Location:
    Herriman, Utah
    Had the same problem with my 20ga. Grand. I started using Rem RXP20 wads and had more success. Kent Sakamoto at RCBS explained that one of the problems with loading 20ga. on the Grand is the inconsistancy of case lengths. Bill
     
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