RCBS .37-250-FN

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This bullet is the most accurate bullet I have for my 38-55s. It casts too small for my use at .378 out of 10WW + 1 50/50 solder. I special ordered a mold which casts a little large at .383 but it is quite usable. THE PROBLEM with both molds is bullet shrinkage and frosting in certain areas. I have cast as low as 600 degrees and have tried alternating the 2 molds and I have tried other alloys and I have cooled the molds under a fan for 15 sec between pours. My success rate is only about 30%.
The molds are Iron and I think too small for the bullet size. I would like to see NOE produce a larger mold in aluminum or possibly brass. I would also suggest 2 different mold sizes one casting at .376 and another at .382. What say you?

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[Mike BambauerParticipant]

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I have a one of the RCBS original molds and size it down to .369″ for my 9.3X62..
It is the most accurate cast bullet out of that rifle..
Would love to have one @ .382″ for my 38-55’s..

[Author]

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