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.300 Win Ultra Mag question

Discussion in 'Rifle Country' started by mwurman, Jun 6, 2011.

  1. mwurman

    mwurman Well-Known Member

    Just bought a Savage Arms Model 116. takes a .300 Win Ultra Mag. When i bought it, the ammo they sold me was .300 Win Mag. So of course being all excited to shoot the new gun, took it to the range and took care of ten rounds. They loaded in just fine, chambered, fired, and the case ejected just like a text book case. Afterwards, i was looking at the casings versus an unfired round, and they had expanded ever so slightly. Hence why i am posting on here. Is it ok to continue firing these rounds in this gun? Thanks!
  2. rcmodel

    rcmodel Member in memoriam

    Not until you find out what caliber it is anyway.

    The first thing you need to do is read the caliber marking on the barrel.

    It can't be a Win .300 Ultra Mag, because there is no such caliber.

    There is:
    A .300 Win Mag.
    A .300 H&H Mag
    A .300 Rem Short Action Ulta Mag, or .300 SAUM.
    A 300 Win Short Mag, or .300 WSM.
    And a .300 Rem Ultra Mag.

    But there is no such thing as a .300 Win Ultra Mag.

    I beleive it is very likely your rifle is in fact a .300 Win Mag, as that is the only .30 cal magnum Savage chambers them in currently.

    The differance in fired case appearance is due to normal case expansion when the case blows out to fit the chamber.

    Last edited: Jun 6, 2011
  3. mwurman

    mwurman Well-Known Member

    yeah i was about to post the correction...is .300 Rem Ultra Mag (RUM)

  4. rcmodel

    rcmodel Member in memoriam

    Well, that's what you need to shoot in it then.

    Do not fire any more of the .300 Win Mag in it!

    The .300 RUM does not have a headspace belt on the case, and the .300 Win belted case is smaller then the rear of the chamber in your rifle. That will allow it to chamber, but headspace would not be controlled at all except by the extractor.

    You are lucky you didn't blow yourself up already.

  5. MtnCreek

    MtnCreek Well-Known Member

    Please post some pics of the fired cases beside loaded cartrigdes. I would like to see them.
  6. Flatbush Harry

    Flatbush Harry Well-Known Member

    If you only buy the ammo whose caliber, printed on the box and on the case head, matches the name on the barrel, you won't blow things up or harm your equipment. This is an IQ test.


  7. MtnCreek

    MtnCreek Well-Known Member

    Mr. Harry, I think the above is a good, useful statement. The rest of your post was not useful.
  8. mwurman

    mwurman Well-Known Member

    I know now not to trust the guy who sold me the ammo...I'll post pics when I get home from the day. Just interesting how it safely shot, and accurately, 10 rounds of win mag. I'm definitely returning the unused box and getting the correct ammo.

    Sent from my iPhone 4 using Tapatalk
  9. Steve H

    Steve H Well-Known Member

    How close is the scope to the barrel??? In the pic posted it looks pretty close.
  10. mwurman

    mwurman Well-Known Member

    It's just the angle of the photo I think...there's plenty of clearance...when I put the caps on the ends there's still space. Not the best pic but here's with the caps on...


    Sent from my iPhone 4 using Tapatalk
  11. mwurman

    mwurman Well-Known Member

  12. mwurman

    mwurman Well-Known Member

    Here's some pics...as you can see the casing expanded out width wise to the size of the chamber as well as at the neck area, and base.

  13. Flatbush Harry

    Flatbush Harry Well-Known Member


    That's not minor expansion.

  14. mwurman

    mwurman Well-Known Member

    well in the light of the shell not exploding, i'll go with minor ha
  15. OKcarburetor

    OKcarburetor Active Member

    :eek: wow... just wow
  16. NoobCannon

    NoobCannon Well-Known Member

    yeah...Don't do that....that can't be good for your health if you keep doing that.

    Don't hesitate to slap the guy that sold you that ammo. A competent gun store employee should at LEAST have enough snap to him to read what's stamped on the barrel, while a good salesman period should know about what he's selling.
  17. MtnCreek

    MtnCreek Well-Known Member

    That is freakin beautiful !!!
    Thanks for the photos!
  18. Demos

    Demos Well-Known Member

    I never would have guessed you could fire form 300 winmag into 300 RUM with only ever so slight expansion. Can you take a picture of the fired cases next to unfired 300 RUM when you pick some up?
  19. mwurman

    mwurman Well-Known Member

  20. Dimis

    Dimis Well-Known Member

    just curious but did you buy this rifle/ammo from a large chain store or a small gun store?

    I can see (and have had) this type of thing happening at say walmart or gander mountain where they need nothing more than an application to work there

    if it was a small time gun store I certainly would do my own homework on anything I buy from them before ever even thinking of purchasing that way you negate the miss information they can obviously provide

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