Help, Swiss K31, what size mold?

[Geezer Ray]

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.:oops:

[Bohica793]

Slug it and pound cast the throat. I'm betting .312-.314.

[ukrifleman]

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

[Maven]

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".

[garandsrus]

I normally use .310 bullets. No issues other than setting the seating depth to match the throat, as was mentioned.

[Geezer Ray]

Thank You so much for your replies.