Ultra Mag Powders and Barrel Life

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by MontanaRifleman, Nov 13, 2009.

  1. MontanaRifleman

    MontanaRifleman Well-Known Member

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    I dug up an old (4 yrs) thread on this subject and wondered if anyone might have some experience or anything to add.

    http://www.longrangehunting.com/forums/f19/barrel-wear-7mmrum-10472/

    In the article, Kirby says he believes the large overbores can get improved barrel life by switching from the stick powders to the newer ball powders which he believes are fairly temp stable and will burn "clean" at higher pressures. These include Ramshot Magnum and AA8700. He says these powders dont burn as "hot" as the stick powders.

    Kirby, sorry to take your name in vain, :) but I find this a fascinating subject, especially scince I have a 300 RUM and am considering a 7.

    Anyway, was wondering if anyone else has any experience and insight with this that they could share on the subject. Any one using these powders in their Ultra's?

    Mark
     
  2. RockZ

    RockZ Well-Known Member

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    I spoke with the folks at sierra asking about data for the 6-284 and they said that was the case.
     

  3. 3006savage

    3006savage Well-Known Member

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    I had read recently that US869 was an "extremely cool burning" powder but can not for the life of me remember the source so take it with a grain of salt. It certainly makes sense to me that if two powders shot the same number of rounds in the same amount of time and the barrel was cooler with one vs the other the barrels life would likely be affected adversely by the hotter powder. That is something you could easily verify yourself at the range.
     
  4. elkaholic

    elkaholic Well-Known Member

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    I had a 300 rum with a 30" barrel and put 2500 rounds through it (still good) I shot primarily H870 which is no longer available from Hodgedon. This powder would produce 100 fps more velocity than ANYTHING else! You can still get T870 from Thunderbird Cartridge in Az. It is identical to the old H870 (military surplus) and I would highly recommend it.......Richlightbulb
     
  5. royinidaho

    royinidaho Writers Guild

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    I have more rounds than I should have through a 270 AM barrel. Most w/US 869 couple of 100 w/7828ssc.

    Barrel is in "much" better shape than one would expect according to a "local" smith who says he "knows" things about barrels??????:rolleyes:
     
  6. J E Custom

    J E Custom Well-Known Member

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    Mark
    The military did a lot of testing to determine what type of powder was best for long wear
    and determined that the ball powder seamed to be less abrasive on the throat of barrels.

    They felt that it was the shape instead of burn rate or temperature. The stick powders eroded
    faster because of the sharp edges on the cylindrical powders.

    They were also looking for a certain port pressure for there gas guns and the ball powder
    was easier to predict at barrel lengths to the port.

    As to the issue of cooler or less temperature sensitive , There are some ball powders that
    are extremely temp sensitive. (One of my favorite powders ,H414 is one of those) but there
    are some stick powders that are also heat/temp sensitive.

    I feel that poor barrel maintenance has more to do with barrel ware that any other one thing.

    Case capacity,velocity,barrel temperature, cleaning,type of powder, amount of fouling all
    contribute to barrel ware. That is the reason the military tries to hold velocity to around
    3000 ft/sec, use ball powders and know that the rifles cannot be cleaned every time they
    are shot. And also temperatures will sometimes be high during a fire fight.

    I have barrels that use stick powder that have over 20,000 rounds through them and accuracy
    is still sub 1/2 MOA.

    On the big Magnums I use a lot of H 50BMG (Stick) and H869 (Ball) depending on what the rifle
    likes and don't worry about the barrel getting 20,000 rounds through it because they are
    hunting rifles and with proper cleaning they should last a lifetime.

    So enjoy the rifles and feed them what they like.

    Just my 2 cents

    J E CUSTOM
     
  7. woods

    woods Well-Known Member

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    Don't know where I picked this up but here it is
    [​IMG]

    Might convince a few to use faster powders :)
     
  8. MontanaRifleman

    MontanaRifleman Well-Known Member

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    I really appreciate the imput everyone, it was enlightening. I'll probably try some of thes other powders as I get the time to and probably go with which everone gives the best performance.

    Thanks again,

    Mark
     
  9. J E Custom

    J E Custom Well-Known Member

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    Just curious ,What is the source of this chart?

    I have never had a barrel that was gone at only 400 rounds and I was wondering
    How this data was compiled and by whom.

    It may be computer generated and not real world results.

    Just curious.

    J E CUSTOM
     
  10. woods

    woods Well-Known Member

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    I wish I knew J E. The downloading on my computer says I have had it since January of this year. I will do a search and see if I can find out.