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Thread: Help, Swiss K31, what size mold?

  1. #1
    Boolit Mold
    Join Date
    Aug 2016
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    Norrtheast Georgia
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    Help, Swiss K31, what size mold?

    I just got several Swiss K31 rifles from an estate and would like to cast some lead for them. I have lots of brass and everything I have seen so far says to use .308 bullets. Molds I have found so far have .309 size. Any help would be great. Thank You. I am new to old military rounds so please don't hit me to hard.

  2. #2
    Boolit Master
    Bohica793's Avatar
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    Aug 2013
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    LA (Lower Alabama)
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    643
    Slug it and pound cast the throat. I'm betting .312-.314.
    Protecting this country and it's communities isn't just the job of soldiers and police, but of every patriot who is capable.

  3. #3
    Boolit Master
    Join Date
    Nov 2011
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    511
    I use a Lee 155gn 7.62x39 bullet (mould No.90385), gas checked to .309 in my K31 with good results.

    K31's tend to have short throats so ogive can be an issue.
    ukrifleman

  4. #4
    Boolit Master Maven's Avatar
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    Mar 2005
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    Had two of them several years ago. The [slugged] bores required a CB sized to .309" (both rifles). Btw, some CB designs shot better than others...as long as they were sized to .309".

  5. #5
    Moderator Emeritus
    garandsrus's Avatar
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    Jan 2006
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    Warren, MI
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    I normally use .310 bullets. No issues other than setting the seating depth to match the throat, as was mentioned.

  6. #6
    Boolit Mold
    Join Date
    Aug 2016
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    Norrtheast Georgia
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    Thank You so much for your replies.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check