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Gold Dot 125 gr. actual bullet diameter ?

Discussion in 'TOP GUNS *357 Sig* Club' started by Glockbuster, Aug 23, 2010.

  1. Glockbuster


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    Jun 30, 2005
    Middle America
    I had always thought the 357 Sig was a perfect .355 bullet in diameter, but I've read of an optimum .3555 or .356 diameter. The 1 gr. difference in bullet weight between the 9 mm and 357 Sig had me always wondering about its reason to be. Why produce different bullets of the same diameter ? One Speer expert told me it was in the design to help it perform ideally at higher velocities. Could it also be that there exists a minimally higher diameter ?
    I know Speer shaves their bullets once the cartridge is assembled but this is not exclusive to the 357 Sig, I think it has more to do with giving the bullet its final correc shape because of the bonding process.