Questions About Reloading for the Mosin?

Discussion in 'Ammunition & Reloading' started by Trez, Sep 29, 2011.

  1. Trez

    Trez Well-Known Member

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    My Mosin has become a case queen ever since I got my Arisaka.. So I want to change that and start reloading for it. I have a 1942 91/30 Sniper...
    My main question is what size bullet should I use? I thought they shot a .3105 bullet, but my book says .308, and C3 said they should measure out to 7.92?? :confused: Im so confused....
    What weight should they be? Ive shot 150 gr. surplus ammo and it constantly shot low, so im thinking something in the 175 gr. area? What specs was the WWII Russian ammo made to?


    Thanks!
     
  2. VitSports6

    VitSports6 New Member

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    Slug the barrel and find out what bullet will work best.

    Mosin Nagant Rifle Bore Slugging Tutorial

    I know I have posted it here before, Try a quick search, I know there is a bit of info here and there.
    Best of luck
     

  3. Firearms4ever

    Firearms4ever New Member

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    The 7.62x54r cartridge uses the same diameter bullet as the 7.62x39 cartridge fired in the AK 47. The diameter of the bullet is actually not .308 it's .312. The Russian when naming their cartridges refer the first numerical figure by the lands and not the grooves like most others do.
     
  4. canebrake

    canebrake New Member

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    Buy new brass with a Boxer primer hole! Military surplus brass was made for.......wait for it........one bang only. :p
     
  5. jpattersonnh

    jpattersonnh Active Member

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    Even Brass case surplus is Berdan primed. As Canebrake said, new Boxer primed brass works best. The bullets I use to reload are .311 to .312. Your scope is calibrated for 180gr. Speer 180gr. round nose shoot very well.
     
  6. Trez

    Trez Well-Known Member

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    Thanks JP! Will there be a big difference between a 174 gr. and a 180gr bullet?

    Im thinking of something like these bullets: Hornady Bullets 303 Caliber and 7.7mm Japanese (3105 Diameter) 174 Grain Full Metal Jacket Boat Tail Box of 100 - MidwayUSA
    What do you guys think?
     
  7. jpattersonnh

    jpattersonnh Active Member

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    I would not sweat it!!
     
  8. JonM

    JonM Moderator

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    Depending on your dies some require a different neck size as most ship ready for 308 bullets. If your dies are 308 try some of those first. Some mosins shoot 308 diameter just fine.

    Mine doesnt i have to use the bigger 311 but i need to order a new inside diameter sizer before i can load more.
     
  9. Trez

    Trez Well-Known Member

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    I havent sluged my barrel, But I think my bore size is around .310.
    Im not sure how accurate this is, but a .308" bullet will go though the barrel with very little resistance, and I have some loaded Seller & Belliot ammo that the bullet measures .3105"/.311", that placed in the muzzle wont touch the brass case...
    What do I do about the neck size?
    Can I use a universal expander? Can I buy dies with the correct diameter?
    *edit*
    I was looking around and the RCBS die set says it comes with a expander assembly, is this what I need?
     
    Last edited: Sep 30, 2011
  10. JonM

    JonM Moderator

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    call the company whom your gonna get the dies from and ask which expander is stock. if you order direct from them they will liekly just ship your dies with the one you need.

    7.62x54r and 303 british are the only two i know of that can use different sized bullets.

    the expander ball 308 or 311 takes care of the diameter. the size die squeezes it down then as the case leaves the die the ball sizes the inside diameter. so only the ball needs to be the right size
     
  11. res45

    res45 New Member

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    I've been reloading the 7.62 x 54r for several years,I shoot everything from pipsqueak 85 gr. .314 dia. swaged lead bullet load to 170 gr. gas checks cast full house loads and several different J bullets.

    The bore on my M44 slugged out at .312 across the grooves,I've found through testing that the .311 dia. J bullets shoot the most accurately the 150 gr.flat base bullets are what I use,mainly the Speer HotCor and Sierra ProHunter. The Hornady .312 150 gr. shoots ok but not as good as the .311's

    Lee dies come with the 308 expander ball which works fine if your loading for a Finn with the .308 to .309 dia. bores or happen to have a Russian that like the small of a bullets for the .311 .312 dia. bullets the 303B expander rod Lee sells for about $3 is what you need, The RCBS dies like I use have both the 308 and .311 expander ball with the die set. I set the FL sizing die up to neck size only.
     
  12. jpattersonnh

    jpattersonnh Active Member

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    Very good point! RCBS does come w/ the .311 ball installed, but has the .308 ball also. That was one reason I bought them.
     
  13. Trez

    Trez Well-Known Member

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    Awesome! I was planing on getting a RCBS set anyways..