M70 Magnum bolt faces

Discussion in 'Firearms & Ammunition' started by Ray B, May 16, 2019.

  1. Ray B

    Ray B AH Elite

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  2. Ray B

    Ray B AH Elite

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    Above are four bolt faces of some Magnum M70s spanning several years of production. Left to Right: 1996 .458; 1953 404; 1991 375 RUM; 1937 375 H&H
    The reason for the comparison was to determine if the extractor for the 375 H&H had been altered. It appears that maybe it was, since it seems to have less shoulder and more taper than the other 3; but it is considerably older than the others so it may have been slightly different specifications from the factory. The interesting aspect of the rifles is that while the depth of the magazines are all constant at 47mm the first three hold 3 cartridges with space to insert a fourth enough that the bolt can slide over it sufficient to chamber it, giving the first three rifles a capacity of four while the older 375magazine can hold 4 cartridges with space to hold a fifth so that it can be chambered, giving the rifle a 5 shot capacity. The rails don't appear to be altered so the only conclusion that I can make is that the H&H cartridges are allowed to spread a little wider (horizontally) in the magazine to allow for the extra vertical space. Anyone having information on this, please chime in.
     

  3. Hoss Delgado

    Hoss Delgado AH Senior Member

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    My pre war model in .375 originally was owned by by Great Granddad who bought it in '38 or '39. He passed it on to my Granddad who gifted it to me . Mine holds 4 rounds in the magazine just like yours does. But unlike yours , mine can't be topped off with a fifth round. When l showed it to a gunsmith , he said that the only way a fifth round can be topped off in the chamber is if a gunsmith opened up the extractors. Very interesting question actually.
     

  4. Opposite Pole

    Opposite Pole AH Enthusiast

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    Mine is a 2014 vintage .416 Rem Mag. 3+1 capacity (user manual confirms this).

    According to my manual the capacity of standard M70 is 4+1, while magnum and WSM are 3+1. The manual states that in order to load the rfile to full capacity one should load the magazine and place a round directly in the chamber and close the bolt while holding down the rounds in the mag. It states that more resistance will be felt on closing the bolt as the extractor has to jump over the rim.

    http://www.winchesterguns.com/content/dam/winchester-repeating-arms/support/owners-manuals/2019/17-WRA-424_Model 70_SR_OM_WEB.pdf

    IMG_1118.JPG
     

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    Last edited by a moderator: May 18, 2019
    ack and Hoss Delgado like this.

  5. Ray B

    Ray B AH Elite

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    That Norma ammunition made quite the impression on the boltface.
     
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  6. Opposite Pole

    Opposite Pole AH Enthusiast

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    Sure looks like that. I bought the rifle new and only shot factory Hornady rounds through it so far. There’s an archaic law in Poland that any new gun sold by a shop needs to be fired 3 times and shells be sent to the police so the imprint on the bolt is from these rounds. What you’re seeing though is not an imprint but rather lack of it. Some Norma cases have markings on the rim carved quite deep (I’ve got a batch of 9.3x74R like that) and if you fire them on a clean bolt face such as in brand new gun without brass deposits on the face yet it looks like an imprint but it’s actually lack of brass deposits where markings were cut in the rim.
     

  7. Nkawu

    Nkawu AH Veteran

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    My M70 standard holds 5 down + 1. It’s a Classic stainless 30-06 with wooden stock (lefty). The mag looks magnum length with a small spacer at the rear. I’m not sure if the ejection port would allow a loaded mag round to exit? Are the ejection ports different for standard and magnum?
     

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