Quantcast
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

interarms mark X

Discussion in 'Rifle Country' started by dpostel83, May 15, 2009.

Thread Status:
Not open for further replies.
  1. dpostel83

    dpostel83 Member

    Joined:
    May 4, 2009
    Messages:
    17
    Location:
    iowa
    ok guys, i hope someone can help. i have an interarms mark x of unknown caliber. myself and 2 other guys i know have searched and search for some sort of markings on it to identify caliber. all that is on it other than manufacturer info is the serial number: A303497. is there a way to findout with just the serial number. my local gunsmith will be out of the shop for another 2 weeks, so i cant have him look at it.
     
  2. kcmarine

    kcmarine Member

    Joined:
    Feb 28, 2007
    Messages:
    1,391
    Location:
    Kansas City, Missouri
    Not sure... measure the muzzle with a measuring tape or calipers... take a picture and show us... that way, you'll at least know the bore diameter.
     
  3. jmr40

    jmr40 Member

    Joined:
    May 26, 2007
    Messages:
    10,094
    Location:
    Georgia
    The Mark X is a popular rifle for a custom gun and it may have been rebarreled to another chambering after it left the factory so I would not trust the SN.

    The chambering is almost always on the barrel and could be on the part of the barrel in the stock. This could happen if it has been rebarreled. Have you taken the action out of the stock?
     
  4. jbaker

    jbaker Member

    Joined:
    May 10, 2009
    Messages:
    28
    Location:
    Alabama
    You could take the stock off and see if the bottom of the barrel was marked with who installed the barrel or take it to a gunsmith and let them cerrosfe the chamber.
     
  5. SaxonPig

    SaxonPig Member

    Joined:
    Apr 11, 2006
    Messages:
    4,787
    The barrel should be marked. If not, a smith can make a chamber cast to determine caliber. I would not guess.
     
  6. MMCSRET

    MMCSRET Member

    Joined:
    Feb 18, 2008
    Messages:
    2,971
    Location:
    North Central Montana, across the Wide Missouri
    As said before the action is no indication of caliber. The bolt face might tell you if its for a belted magnum. I have a new, in the box, Mark X standard face action in my safe, I've had it for 10 years and just haven't decided on a barrel, the inspection papers with it are dated 1989, lots of Mark X actions sold for custom rifles.
     
  7. TexasRifleman

    TexasRifleman Moderator Emeritus

    Joined:
    Feb 16, 2003
    Messages:
    18,302
    Location:
    Ft. Worth
    I have a rifle built on one of these receivers. Many of them were sold as receivers only, for custom builds.

    My barrel was sold the same way, an un-reamed .24 caliber blank.

    It's chambered in a wildcat cartridge, the 6mm-06.

    Having a gunsmith do a casting of the chamber is the only safe method to determine the chambering.

    I absolutely would NOT fire it just because a round happened to fit.
     
  8. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    +1000 TexasRifleman!

    I built mine as a 25-06.

    Sold as actions only in the 70's - 80's, and could have been barreled to any commercial or wildcat caliber based on the 30-06 size case.

    A Cerrosafe chamber cast is the only way to find out what it is at this point.

    rc
     
  9. SuperMidget

    SuperMidget Member

    Joined:
    Feb 22, 2005
    Messages:
    29
    Location:
    Exiled to the South
    Completely non-authoritative answer, but you can get a very close approximation by making several measurements.

    First, measure the bolt face. 0.475" will give you a .308/Mauser/'06 based cartridge. 0.535" is belted magnum.

    Second, measure length of the mag box. 2.8 is .308 based cartridge, 3.1 is x57mm Mauser based, 3.4 is '06 based.

    Third, measure the width of the mag box at 0.05" in front of the rear, and just behind the shoulder stop. This one will be tricky because you will need to do some math on the proper dimensioning of a mauser magazine (formulas can be found over on AccurateReloading by searching that exact term). If it was a custom, and properly done the smith should have modified this at least in the shoulder area for better feeding of minimally tapered cartridges, but this is rarely done unless the smith was a perfectionist. If it has been altered, you can get a rough idea of shoulder dimensions in case the cartridge was Ackley'd or a shortfat or rebated rim cartridge was used.

    Fourth would be to measure the bore diameter on the grooves. This part is important as all Imperial cartridges are groove to groove diameter.


    Again, this is by no means 100% certain, only a cerrocast can be. But it can put you in the proper ballpark to give your smith a heads up on. Also a great way to waste an afternoon. =)
     
  10. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,082
    Location:
    Eastern KS
    I hate to bust your bubble, but all standard length Mark-X 98's used the exact same magazine box.
    The belted mag action used a different one.

    Standard 30-06 length = 3.385" long.
    Short .308, 22-250, etc = 3.385" long, with an internal block.
    Belted Mag = 3.600" long.

    All measureing the grooves will tell you is what caliber the bore is, not what cartrige of that caliber it is chambered for.

    As already stated, the only way to find out what this unmarked one is chambered for is with a Cerrosafe chamber cast.

    rc
     
  11. dpostel83

    dpostel83 Member

    Joined:
    May 4, 2009
    Messages:
    17
    Location:
    iowa
    thanks for the help guys

    i guess i'll have to wait until by gunsmith gets back to work and have him cast it
     
  12. SuperMidget

    SuperMidget Member

    Joined:
    Feb 22, 2005
    Messages:
    29
    Location:
    Exiled to the South
    Mark X's that were made during the same time the yugo plant was making them for Whitworth had the FN pattern magazine box which did call for correct width magazine boxes and different magazine followers. They may have changed this at some point, I don't know, but the early spec' was based on FN contract machines and FN contract plans.

    So far as I know, the only Mark X that uses a 3.6" length box was the .375 H&H. I thought they limited that to only that cartridge because you have to hog out a decent chunk of the action front and rear.

    From the very limited sampling of two early '70s rifles that I have had in my hands, I can tell you that the .30-06 and the .270 WCF had different shoulder dimensions in the magazine box. I haven't taken apart any of the push button Charles Daly's or Mark X's to see if this holds true.

    It may be that we're discussing mangoes to persimmon simply due to the age of the platform and the ownership/distributor changes over the course of nearly 50 years.
     
Thread Status:
Not open for further replies.

Share This Page