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I'm no stranger when it comes to reloading. I have been doing it by the books for over 15 years for my 9mm, 45acp, 30-06. I would like to have the materials on hand and push out some rounds of 7.62x39 so I have the ability to if need be.
But I'm confused in reading and studying this subject as everything points in different directions with the bullets.... Some places say .308 is fine others say never.. some mention .311 others .310.... I just looked up the dies. The RCBS dies for my press say 308 and 311 expander....lol... So which is it???
I know the steel cased surplus ammo is 124 grains and that's it.
 

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Depends upon which rifle you are loading for, there are different bore diameters so they give you different expanders to use. Early Ruger mini 30's had a .308 bore, Russian sks/AK .311. Slug your bore and you will know for sure.
 

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Never slugged the bore on my Mini 30, but know that Rooskie milsurp ammo is much more accurate in it, than the Remington UMC .308 diameter ammo is.

Groups with Wolf ammo are half the size of the ones fired with UMC ammo.
 

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Short answer is that the Russians designated the diameter based on land diameter, not groove diameter.

Western cartridges generally were designated with groove diameter, not land diameter.

Result?

Russian round was designated 7.62 based on land-to-land diameter, so the projectile must be slightly larger to fill the grooves.
 

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Footnote for Krag shooters--- and warning first----

SLUG YOUR BORE BEFORE ATTEMPTING THIS!

But a common thing to make an old Krag that's shooting poorly come to life again is slug the bore. The older ones often are a bit generous inside, and moving to a 7.62 Russian bullet is a common tactic that brings those old Krags around.
 
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