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Thread: Caliber names

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  1. #4
    Member Eion's Avatar
    Join Date
    Nov 2012
    Location
    Dunedin
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    181
    Quote Originally Posted by gimp View Post
    7.62mm groove, 7.8mm land = .308.

    Etc.

    It's to do with land/groove diameters for most of these
    Sums it up. Don't forget about the old designation of caliber over grains of powder like the 30/30 = (caliber)/(grains of powder) = .30 cal (.308/.309) pill backed by 30 grains of smokeless powder.

 

 

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