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M98 rifling twist and cast bullets

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  • M98 rifling twist and cast bullets

    I was surprised to find that the 98 mauser has a 9.25" twist to the rifling while my '03A3 is 12"
    I'm wondering if a heavier cast bullet might work better than the 175 gr cast bullet I'm using right now for the 98?
    Whatcha think?
    Last edited by bojac; 06-17-2018, 07:33. Reason: for the 98

  • #2
    What caliber, 7mm or 8mm? That may also be the clue as to why the different twist rate. I'll bet your 03A3 twist is actually 1:10" unless you had it re-barreled.
    Last edited by hockeynick39; 06-17-2018, 08:01.
    “Better to have, and not need, than to need, and not have.”
    ― Franz Kafka

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    • #3
      Just read the other post you had in the Rifles thread. 7.92 x 57 mm, not too shabby. If it slugs at .3236, your best bet will probably be a .325 or .326 sizer. Anyway, I have had good luck with Accurate Molds for most of my cast boolits. If it were me, I would order this mold in .325 caliber with COWWS or Lyman #2 alloy: http://www.accuratemolds.com/bullet_...=32-215B-D.png. That is, if you use GCs, if not, this one will work too, just don't forget to put a wad or filler in to protect the PB unless you have a PB GC for it: http://www.accuratemolds.com/bullet_...=32-210J-D.png. Good luck and stay safe.
      Last edited by hockeynick39; 06-17-2018, 08:05.
      “Better to have, and not need, than to need, and not have.”
      ― Franz Kafka

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      • #4
        My 8mm Yugo is very accurate with 185 cast from Grdener's Cache. Sized at .323 the are 1/2 groups to 50 yards.

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        • #5
          You are right Hockey. All my military .30 cals are 1:10. Except the 2 M1 carbines. I don't know why it's been stuck in my head for years that the 03s were 1:12 twist. I just looked it up now. and I stand corrected.

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          • #6
            Your 175 grain bullet splits the difference between the original S Patrone bullet weight of 154 grains and the late sS patrone weight of 196 grains. I'd look closer at diameter rather than weight.
            "The fact that guns can kill another human being is the whole point. That\'s why they are so darn good at deterring violent criminals". Ann Coulter

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            • #7
              Ok, since I just got the barrel floated I'll keep tinkering with the 175gr ' till I'm happy before I go bigger. I'm pouring fat bullets close to .325. Just so they grip in the sizer,(honed to .3245), enough to put the gas checks on. Thanks all!

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              • #8
                My Mosin rifles shoot anything from 160 to 215 gr. cast lead bullets very accurately. I have basically the same mold as hockeynick39 posted http://www.accuratemolds.com/bullet_...=31-215B-D.png just in .315" version sized and checked to .314" I chose that mold as it has a nice meplat and makes a good hunting bullet and the length adds stability when I push it up close to max velocity.

                I did some ladder test loads with the 215 gr. bullet cast from WQ WW's last weekend working with 34 to 40 grs. of H-4895 in 1 gr. increments, 34 grs. was a tack driver at 50 yds. Velocity was up in the mid 1900 fps. range before accuracy started to go south with 36.0 grs. but I'm plenty happy with that as around here 100 yds. usually less is about as far as one can get a good clear shot in this heavy wooded area and the bullet is generating a little over 1500 foot lbs. of energy.

                A couple of good threads on cast leads in 8 MM
                http://castboolits.gunloads.com/show...-the-8mm/page2

                http://castboolits.gunloads.com/show...8mm-Mauser-fun
                SKS M59/66A1 / Chinese /26 Poly SKS / Mosin M44 / Savage 99 300 Sav. / Ruger Blackhawk 357/9mm convertible / PA-63 Mak. / Sav. 93G 22 WMR & Sav. Mark II 22 RF.

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