Dimensions for the two Soviet rounds are very close (aside from projectile size obviously) the 5.45mm case is a fraction longer and a fraction thinner at the base.
Approximate case dimensions are
7.62x39mm - base width 11.3mm; case length 38.7mm
5.45x39mm - base width 10.0mm; case length 39.8mm
From what I recall, 5.45mm will load into 7.62mm magazines but isn't recommended and the same applies for 7.62mm into 5.45mm but you can't fit a full 30 rounds in due to its curvature or something like that - been a while since I did any lessons on the AK
Last edited by StainlessSteelCynic; 08-03-2009 at 02:40 AM.
Reason: adding something I forgot
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