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Micro groove barrel and cast

Discussion in 'Handloading and Reloading' started by Mac2, Sep 24, 2011.

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  1. Mac2

    Mac2 Member

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    I've cast and loaded pistol calibers for years, but recently wanted to dabble in casting for rifles. Thought I would start with 30-30. I have a Marlin 336 with the micro groove barrel. I read over in the rifle section a post about the micro groove barrel not being compatible with cast bullets. Any experience with using cast in the Marlins? I've got a 170 gr TL w/ GC mould. Thanks for any experience before I cast a thousand or so. Mac.
     
  2. jerkface11

    jerkface11 Member

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    Gas checked bullets should be fine with micro groove.
     
  3. Raymond Bob

    Raymond Bob Member

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    Cast bullets that are a little over sized to better in the Marlin 336 with micro groove. You can slug your barrel and size bullets .002 over the groove size. I have found that the best result is to size to fit the throat. Basically, use the largest size you can chamber.
    You will find a lot of Marlin's, including mine, do best with a .311 bullet. Many do fine with .310.

    Bob
     
  4. Mac2

    Mac2 Member

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    My mold is a .309 as is my sizer. Too loose or will it still work? Thanks for the replies. Mac.
     
  5. PO2Hammer

    PO2Hammer Member

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  6. the Black Spot

    the Black Spot Member

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    My marlin 444 will group under two inches at 100 yards with cast 310 gr from lee mold using varget powder. I think slower powders help when shooting cast bullets.
     
  7. jcwit

    jcwit Member

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    Marlin also has micro-groove in their .22 rimfire barrels and lead .22 bullets just fine, ssooooooooooo?
     
  8. tackstrp

    tackstrp Member

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  9. GooseGestapo

    GooseGestapo Member

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    I think you'll find that your .309" moulds will cast to .313-.314".

    All of my Lee .309" moulds do. The .309" is the nominal size-too size, not exactly what they cast out at.

    I've shot my .309" sized moulds to .311" through not only my .30/30 MG barrel with excellent accuracy, but have also shot them through a .310" SKS, and even several .303British rifles. I have a .314" Sizer for the .303's, but find that the die only lightly touches parts of the bullet, and dosen't completely size them. It does however apply the lube properly (Lyman 450 die).
     
  10. Sport45

    Sport45 Member

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    What diameter are they sized to?
     
  11. the Black Spot

    the Black Spot Member

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  12. Sport45

    Sport45 Member

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    Thanks!
     
  13. Mac2

    Mac2 Member

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    Thanks to all for the replies. One of my C&B pistols is .31 cal, so I have a supply of .311 rb that is pure lead. Slugged out to .309, so I'll be going with a .311 sizer. These will also be tested in my SKS and Mosin. I'll check the 308 model 788, but they may work in it also after I check it's bore. Again, thanks. Mac.
     
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