>>>Nope. They are all .30. The 7.62 in the diameter of the bullet in mm. 7.62mm =.3".Nope. They are all .30. The 7.62 in the diameter of the bullet in mm. 7.62mm =.3".<<<
Listen carefully. The "7.62" Russian is not the same as the .30 caliber used in the 30-06, .308, 30/30, and .30 carbine.
>>>Look up a bullet manufacturer like Speer. You won't find a ".311" bullet listed.<<<
Actually, they are common. The following link is Hornady's list of Russian 7.62x54 bullets. The bullets are listed as .310 and .311 inches:
http://www.realguns.com/loads/762x54r.htm
It is okay to reload a .308 bullet into a Russian casing, but not the other way around. A Russian bullet will increase chamber pressure in a .308Win or a 30-06.
If you intend to reload, I would recommend you make a habit of NEVER, EVER making assumptions like you did with the Russian bullet diameter. Reloading with too large a bullet diameter is just as dangerous as improper case trimming or overloading powder.
http://members.nuvox.net/~on.melchar/762russ/index.html
http://www.russian-mosin-nagant.com/reloading.htm
http://7.62x54r.net/MosinID/MosinAmmo.htm
Further, the Russian bullets weren't swagged and could vary by up to .02, so if you want to pick another friggin' nit, your CUPs might rise by a few hundred but you probably won't notice this unless you are pushing max compressed loads on a bench gun.