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how tight to the grooves can I be?

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

  1. akolleth

    akolleth Well-Known Member

    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 Well-Known Member

    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

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

    USSR Well-Known Member

    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.

  5. dmftoy1

    dmftoy1 Well-Known Member

    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


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