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I have a dumb question, more about caliber than hunting. I was wondering what the second number in 7.62x51 was. I see a different second number and I'm not sure what it is. If there are already posts about this sorry, but please let me know. Thanks for the help
 

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I believe the second number represents the length of the case in millimeters. For example the 7x57 means the bullet has a 7 mm diameter and the case is 57 mm long. In your case, the bullet diameter is 7.62 mm and the case length is 51 mm. Hope this helps.
 
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I believe onehorse is correct, the second number is the length. I sadly missed that day at school when they taught the conversions. 7.62 is 30 cal which is .308 clear as crystal right?
 

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insert pointy end towards front of gun:wallbash:
 

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.308 is 7.62 NATO which is 7.62x51. The pig (the beloved M60) as well as its successor, the 240B are 7.62 NATOs.

And yeah it is case length in mm. My M44 is 7.62x54. Beullet diameter for the AK, SKS, Mosin, or .308 is the same its just what size the casing is.

AK, SKS = 7.62x39
.308 = 7.62x51
Mosin = 7.62x54
 
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