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357 automag m1 carbine

jeff slater
Hey,
I inherited a m1 carbine that was converted to something called 357 automag. The cartridges are 1.3 inches long and made from cut down 30-06 cases formed into a bottle neck. The bullets seem to be .375 150 gr soft points. I have 500 cases and 20 loaded cartridges and a set of rcbs dies. I need reloading data and any info about this combo. I think it was done around 1975. I was wondering if the carbine can take the pressure of this conversion too, and some ballistic info. I'am thinking it might be a nice short range (brush gun) for deer.
Thanks
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Comments

8 comments

Date Votes
  • landtrain
    Mr. Slater. I've been collecting M1 Carbines for a long time and have not come across one in this caliber. Obviously a somewhat hot, home made wildcat.

    I have the .22 Johnson and a .25 Cal something or other. I also have a 45 Win Mag and have handled the .256 Winchester Magnum, (a .357 necked down to a .25 cal) but not a .357 Auto Mag. I am familiar with the Automag family of handguns,(actually a standard .357 rimmed cartridge fired from a semi-auto handgun.) I have not seen nor heard of a Carbine chambered for it.(that don't mean much either.) As for taking the pressure of this large of a case and a .375 bullet combination,in the original Carbine barrel, I would stand back about 100 feet with a string the first few times I fired it. I would take it to your most trusted smith and have him do a very through material weakness inspection.

    Is this a GI Carbine receiver? Stock, Upper handguard?
    I would like to get some more information from you and see if anyone in the Carbine Club has come across this particular caliber. E-mail me at dandjent@infi.net if you be willing to give me some time. Thanks. Dan E.
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  • CHGOTHNDER
    Strange one, I'm curious also. PLMK

    PJ

    If nobody seen you do it, how could you have done it. NRA Life Member, AF&AM
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  • hatchettman
    ive been collecting carbines for 35 years all makes, all variants and all converted calibers, but ive never heard of this combo!!! i think id let my X-WIFE fire this one 1st !!!!!! good luck!!!
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  • perry shooter
    ARE you sure this is a m1 carbine that started out as a 30 carbine? there is no way that the bolt face could be opened up to 308 size that is the size of 357 automag which was a necked down 44 automag. I think you are confused on what rifle you have.
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  • CHGOTHNDER
    Carbine[?] Nope... maybe the Garand? The garand could possibly be done that way, Anyone else think so??

    PJ

    If nobody seen you do it, how could you have done it. NRA Life Member, AF&AM
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  • duckhunter
    SURE WOULD LIKE TO SEE THE PICS

    I WOULD RATHER BE DUCK HUNTING.
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  • mark christian
    Many years ago there was a gentleman named Bruce Dow who modified M1 carbines to fire the 5.7mm Spitfire, the .221 Remington Fireball, and his own special rimless .357 Magnum cartridge. If you look at the two cartridges you can see that the OAL of the carbine cartridge is identical to the .357 Magnum, although case diameters differ. I am afraid that I have never seen an example of Mr. Dow's modified carbines and I have no other information about the special .357 rimless round. The actual .357 Automag just seem to be out of the question as far as adopting to the carbine since it, like the .44 Automag, is based on the .30-06 round necked down...although again the OAL length is nearly the same as the .30 cal carbine cartridge. I'd like to know more about this carbine and its ammunition.

    Mark T. Christian
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  • gap1916
    Not to change the subject but did some one make a M-1 carbine modification to use browning Hi Power mags and shoor 9mm? I thought I saw one of these once. [8D]

    Greg
    Former Marine
    A N G L I C O
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