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There is a lot of debate as to the which is the better survival cartridge. These two cartridges are mentioned more than anyother in a apples ot apples comparision but really is is apples ot oranges. Simply it is the 5.56 has greater effective range is flater shooting and has faster ballistics and is a lighter round so more ammo can be carried. Generally the firearms that shoot the 5.56 are a couple to 4 pounds lighter than the 7.62x39 weapons unless they are over Whamboed.
http://en.wikipedia.org/wiki/5.56_x_45_mm_NATO
http://en.wikipedia.org/wiki/7.62x39
http://en.wikipedia.org/wiki/AR-15
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=118x150779
http://en.wikipedia.org/wiki/AK-47
I added the Dem Underground link. Verry interesting.
http://en.wikipedia.org/wiki/5.56_x_45_mm_NATO
http://en.wikipedia.org/wiki/7.62x39
http://en.wikipedia.org/wiki/AR-15
http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=118x150779
http://en.wikipedia.org/wiki/AK-47
I added the Dem Underground link. Verry interesting.