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Thread: 30/40 Krag rolling block Question

  1. #1
    Boolit Master brstevns's Avatar
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    30/40 Krag rolling block Question

    What should one keep psi in a Model #5 rolling block rebarreled to 30/40 Krag.
    Does anyone have some good loads? Plan on using 311284, 311291 , 310299 and a Lee 155 for the SkS. Just looking for 1800 to 2000 fps.

  2. #2
    Boolit Master uscra112's Avatar
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    I know nothing about rolling blocks, except that there were 7mm varieties. One of those could be loaded to 7mm pressures, since the Krag case is slightly smaller at the base.

    Then I look at data that says 7mm is loaded to 50,000 psi. Seems an awful lot for the early Mauser rifles, let alone a rolling block. But if you're shooting only cast, your pressures won't get anywhere near that. My Krag loads for cast 200 grain GC bullets are at most 30k psi.
    flectere si nequeo superos, acheronta movebo

  3. #3
    Boolit Buddy
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    IIRC the No 5 was the smokeless powder action most often found in 7mm Mauser. If this is correct it was built to take pressures somewhat in excess of the 42K psi max of the standard Krag loading. Cast loads in the range you mention are well below that range, any cast loads listed in various manuals are in the mid 30K range. Even full power jacketed loads are barely hitting 40K. If the No 5 is a BP action disregard the above.

  4. #4
    Boolit Buddy
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    Very good question. Who rebarreled the rolling block and what was the reason? Those old RBs were made over a century ago, I would be careful with any loads.

    Adam

  5. #5
    Boolit Grand Master Texas by God's Avatar
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    I'd start out with about 30 grains of IMR 3031. Please post pictures when you start playing with that gun I would really like to see it.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  6. #6
    Boolit Master

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    I know that someone on the forum has all the rolling block answers, and I'm seeking a few myself! I recently acquired what I believe to be an 1870s Argentine RB carbine in .43 Spanish. I searched the internet for quite awhile and could only find one recommended load which used 28 - 31 gr. of 4198, but didn't specify a bullet weight. I'm going to start with 370 gr., and did get one recommendation for Trail Boss from a fellow forum member, who suggested 12 - 15 gr., said that's what he uses, but that it would probably take more. If it was a .30-40 Krag chambering I think TbG's suggestion would be a good place to start, or maybe a starting load of IMR 4895. Then, there's the 12 gr. of Red Dot load that many use as a started in old military rifles. I was tempted to try that, but the cartridge case is so cavernous I think I'd do better with the bulky Trail Boss. Anyway, perhaps someone "in the know" will chime in, as I know that there are many RB collectors and shooters out there.

  7. #7
    Boolit Master brstevns's Avatar
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    The number 5 rolling was designed for smokeless powder, was chambered in 7mm, 8 label, 7.62x54 russian and the 30/40 Krag.
    Mine was a 7mm that is beening rebarrel.

  8. #8
    Boolit Master brstevns's Avatar
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    Quote Originally Posted by Der Gebirgsjager View Post
    I know that someone on the forum has all the rolling block answers, and I'm seeking a few myself! I recently acquired what I believe to be an 1870s Argentine RB carbine in .43 Spanish. I searched the internet for quite awhile and could only find one recommended load which used 28 - 31 gr. of 4198, but didn't specify a bullet weight. I'm going to start with 370 gr., and did get one recommendation for Trail Boss from a fellow forum member, who suggested 12 - 15 gr., said that's what he uses, but that it would probably take more. If it was a .30-40 Krag chambering I think TbG's suggestion would be a good place to start, or maybe a starting load of IMR 4895. Then, there's the 12 gr. of Red Dot load that many use as a started in old military rifles. I was tempted to try that, but the cartridge case is so cavernous I think I'd do better with the bulky Trail Boss. Anyway, perhaps someone "in the know" will chime in, as I know that there are many RB collectors and shooters out there.
    Might want to try AA5744 works great with a 24 gr load in my 43 spanish using the Lyman bullet.

  9. #9
    Boolit Master

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    Great! Another good lead. I'll write it down.....and I do have some AA5744. Thanks.

  10. #10
    Boolit Master brstevns's Avatar
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    Quote Originally Posted by Texas by God View Post
    I'd start out with about 30 grains of IMR 3031. Please post pictures when you start playing with that gun I would really like to see it.

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    Will do. still wating to get it back from the Gunsmith.

  11. #11
    Boolit Master brstevns's Avatar
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    Quote Originally Posted by brstevns View Post
    Will do. still wating to get it back from the Gunsmith.
    Smith says next week, keeping my fingers crossed.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check