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how tight to the grooves can I be?

Discussion in 'Handloading and Reloading' started by akolleth, Mar 16, 2008.

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  1. akolleth

    akolleth Member

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    How close to the actual groove diameter can you be with a bullet?

    I slugged my 1938 Izzy Mosin 91/30 and got a reading of .312

    Can I use a .311 jacketed bullet for reloading, or is that too tight? I imagine I can, but don't want to load it too tight and end up with a kaboom.
     
  2. jr45

    jr45 Member

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    Yes. You can use jacketed bullets at or below the grove size. I believe you can go .001 above grove and be fine...I have not tried it.
     
  3. Walkalong

    Walkalong Moderator

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    If you are confident in your measurements, .001 under with jacketed will shoot fine. :)
     
  4. USSR

    USSR Member

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    I shoot .309" Lapua D46 bullets all the time in my .308 FN SPR. No problem going .001" over in bullet size; going slightly under in bullet size is also ok, but accuracy may suffer.

    Don
     
  5. dmftoy1

    dmftoy1 Member

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    If it slugged out at .312 then I wouldn't have any problems with a .313 jacketed. (if you could find one) or even a .314 cast. (I'd start with a .313 though. :) )

    Sounds like a perfect candidate for the Hornady 150 Grain Spire points at .312 . .at least that's where I'd start if you don't cast your own.

    Just my .02

    Regards,
    Dave
     
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