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Heavy or light ammo accuracy

Discussion in 'Rifle Country' started by DMK, Jan 2, 2003.

  1. DMK

    DMK Mentor

    Dec 24, 2002
    Over the hills and far, far away
    I've noticed that my 27" barreled Finnish M/39 Mosin-Nagant groups much better with ammo in the 140gr. range, but my 20" barreled 91/59 Mosin carbine is the opposite, grouping better with ammo in the heavier 180gr. range.

    These two are my most accurate Mosins, but my other M/39 and my 1938 carbine also seem to follow the same pattern.

    From what I understand, the twist rate is the same on all of these. What other factors could contribute to a rifle preferring heavier or lighter ammo? Is the shorter barrel a big factor? Perhaps better tolerances on the Finn rifles over the Russians?

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