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The 6.5×58mm Vergueiro is a centerfire rimless cartridge designed in 1904 specifically for the Mauser-Vergueiro, chosen as service rifle of the Portuguese Army.It was adopted to replace the rimmed 8×60mmR Guedes and 8×56mmR Kropatschek Corto cartridges originally filled with blackpowder, which had been used with Kropatschek rifles procured in the mid-1880s.
56 Fe is the most abundant isotope of iron. It is also the isotope with the lowest mass per nucleon, 930.412 MeV/c 2, though not the isotope with the highest nuclear binding energy per nucleon, which is nickel-62. [7]