7 X 57 Mauser.
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Thread: 7 X 57 Mauser.

  1. #1
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    I have a question for the reloaders on the board. I picked up an 1898 Brazilian crested Mauser (mint in the grease) with a bayonet. This gun will be used for an unofficial military reenactment shoot at 100-yard.
    Here is my question. I would like to load this cartridge below the minimum recommended starting grains of 36 grains of IRM-3031. Would it be safe to use 30 grains of IMR-3031, using a 150-grain bullet?

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    I think 30 grains of IMR-3031 would be a safe load but you likely will encounter erratic performance due to the large amount of air space in the case. Without knowing what velocity you are aiming for, I would recommend going with a faster powder (such as IMR-4198). The IMR loading data for 7X57 lists 29.0 gr of IMR-4198 with a 145 gr bullet at 2260 fps and 28.5 gr of IMR-4198 with a 160 gr bullet at 2135 fps. You should be able to reduce the loads by 10% without difficulty although accuracy may be less.

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    Thanks for your reply and the information George. Velocity is not really all that important in this case the comfort level is what I'm more interested in.



    [This message has been edited by Al Flipo (edited 04-13-2004).]

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    I don't know how far afield you want to get with this but if you want really reduced loads, the best powder to use is SR4759. This is a powder especially designed for reduced loads. The IMR data lists a charge of 23.0 gr of SR4759 with a 145 gr bullet giving 1835 fps, which is 700 fps slower than the 3031 full power load. And again you could go 10% lower.

    Accurate Arms shows 18 gr of XMP5744 with a lead bullet but no loads with jacketed bullets.

    I use 20 gr of SR4759 in .30-06 with 180 gr bullets and 15 gr in .30-30 with 170 gr bullets so I think you would be safe with 20 gr of SR4759 with a 7mm 150 gr bullet. But this is free advice, not tested data, so you must assume the risk of using it.

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    g gaskill

    i have a few 4# cans of 4759 left over from sheutzenfest days in the 70's if ur interested...worked well in 32-40 & 32-35 stevens ( when the lube/temp & celestial alignment were fortuitous)...not sure how to get them to calif. from ky. ........probably get them to friendship muzzle matches.....

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    Last two cans I interstated were in checked baggage on a common carrier airline. Long before 9/11.

    I'll bet you can ship them UPS; I have received BP that way. Fedex probably also will take it.

    Happy to have it but I bet you could find a local shooter who could use it.

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    Thanks George, I picked up a couple cans of 4759 on a gun show yesterday, and I will loading some in the coming weeks.


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