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7.62 mm caliber is a nominal caliber used for a number of different cartridges. Historically, this class of cartridge was commonly known as .30 caliber, the Imperial unit equivalent, and was most commonly used for indicating a class of full power military main battle rifle (MBR) cartridges. The measurement equals 0.30 inches or 3 decimal lines, written .3" and read as Three-Line.
7.62 mm refers to the internal diameter of the barrel at the lands (the raised helical ridges in rifled gun barrels). The actual bullet caliber is normally 7.82 mm (.308 in), although Soviet weapons commonly use a 7.91 mm (.311 in) bullet, as do older British (.303 British) and Japanese cartridges.

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  1. CountryGent

    H&K 770?

    Has anyone had experience with the H&K 770 rifles? They are a .308 / 7.62㎜ sporting rifle produced back in the day. I'm not up on all things H&K, but the traditional styling, the chambering, and the 4 and 10-round magazines are interesting. The one I'm looking at on an auction site has some...
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