Heavy or light ammo accuracy


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DMK
January 2, 2003, 10:57 AM
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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