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

which powder burns faster/slower?

Discussion in 'Handloading and Reloading' started by gofastman, Oct 8, 2011.

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

    gofastman Member

    Joined:
    Mar 9, 2010
    Messages:
    1,062
    Location:
    MN
    2400 or AA#9?
    I have looked at a couple different burn rate charts and have conflicting answers

    bonus unrelated question:
    is AA#9 the slowest powder for 10mm Auto?
     
  2. Hondo 60
    • Contributing Member

    Hondo 60 Member

    Joined:
    Sep 6, 2009
    Messages:
    5,378
    Location:
    Manitowoc, WI
    Which is worth more 2 nickels or a dime?

    They're so close that even the so-called experts can't decide.
    Anyway, for what it's worth, Hodgdon, which makes neither, says 2400 is a hair faster.
     
  3. GP100man

    GP100man Member

    Joined:
    Mar 16, 2007
    Messages:
    1,749
    Location:
    Tabor City, NC.
    AA#9 is comparable to H-110 in speed , 2400 is a tad faster & more tolerable to down loading .Maybe down loading is`nt the rite word , broader band of good operating pressure , there fixed !!!!

    A slower powder would be IMRs 4227 for the heavies .

    But no data with that powder though.

    Here`s alink to Hodgdons site http://data.hodgdon.com/cartridge_load.asp

    Have fun ,BE SAFE !!!
     
    Last edited: Oct 9, 2011
  4. Walkalong

    Walkalong Moderator

    Joined:
    Nov 20, 2006
    Messages:
    48,363
    Location:
    Alabama
    Burn rate charts are relative. Powders behave differently in different calibers. Two powders close to each other on the burn rate chart may flip flop depending on caliber.

    Since I do not load 10MM, I can not give any input on which is "faster" in that caliber.
     
  5. rfwobbly

    rfwobbly Member

    Joined:
    Nov 14, 2008
    Messages:
    3,942
    Location:
    Cornelia, GA
    What? There's a caliber Walkalong doesn't own? :evil:
     
  6. GP100man

    GP100man Member

    Joined:
    Mar 16, 2007
    Messages:
    1,749
    Location:
    Tabor City, NC.
    Most report good results with IMRs HI SKOR 800X.

    Done alittle searchin & 4227 may not be fast enuff to cycle the pistol at the rite time ???
     
  7. Steve C

    Steve C Member

    Joined:
    Jan 5, 2006
    Messages:
    4,696
    FWIW load data usually shows approximately 1.0 grain less in a start and maximum AA#9 load than the same bullet with 2400 in the .357 mag. That indicates that AA#9 is a tad bit faster.
     
  8. ArchAngelCD

    ArchAngelCD Member

    Joined:
    Nov 25, 2006
    Messages:
    22,573
    Location:
    Northeast PA, USA
    I thought AA#9 was a bit faster than 2400 but like said above, powder burn rate is caliber specific.
     
  9. gamestalker

    gamestalker member

    Joined:
    Sep 10, 2008
    Messages:
    9,832
    Location:
    SW Arizona
    Burn rate is relative only to the cartridge application being used. Example, H-110 in a .270 win. cartridge would react as an extremely fast burning powder, where as in it's intended application as a magnum wheel gun powder, it is about the slowest burning powder available.

    Those burn rate charts are of no real use in my opinion. May be someone who knows something I'm unaware of, can justify their purpose?
     
  10. kingmt

    kingmt Member

    Joined:
    Nov 17, 2009
    Messages:
    3,604
    That just doesn't make since. Using it in a rifle doesn't make it faster. There is actually more air space in the .270 & it will take a lot more powder for it then the .357Mag.

    I find burn rate charts very useful in developing loads & going off the map. I just picked one chart & go with it but if one powder is in place 39 & the other is at 40 then they are the same rate.
     
  11. Walkalong

    Walkalong Moderator

    Joined:
    Nov 20, 2006
    Messages:
    48,363
    Location:
    Alabama
    No, it doesn't, but is is extremely fast for a rifle caliber, which is his point I believe.
     
  12. kingmt

    kingmt Member

    Joined:
    Nov 17, 2009
    Messages:
    3,604
    You can make more use of slower powders in a rifle but faster powder is still faster regardless if it is used in a rifle or pistol.

    I don't know if one powder changes burn rates more then another depending on chamber dimensions or if they are so close it is just where they wrote it down.
     
  13. Kosh75287

    Kosh75287 Member

    Joined:
    Jan 31, 2008
    Messages:
    407
    Location:
    Nemo, TX
    I'm BETTING that mean chamber pressure of the load/round in question will alter the burning rate of powders also. I don't know where the threshold for altered burn rates is, but I can easily imagine the burn rate of, say, RedDot, being very different for a .38 Spl target load (perhaps 3.0/RedDot/158SWC) vs. a .357-level load (say, 5.3/RedDot/158SWC). I suspect that Alliant Power Pistol might be more illustrative of the effect, though I hasten to add that I've never worked with it.
     
  14. Fishslayer

    Fishslayer Member

    Joined:
    Jan 1, 2010
    Messages:
    1,971
    Location:
    People's Republik
    Not all those burn rate charts were calculated under identical conditions.


    Ummm... I dunno... Maybe to find out how fast one powder is relative to others?:rolleyes:

    Something not on the burn rate charts is pressure curve, IE, how does a powder react to increased pressure. Titegroup leaps to mind as a touchy powder. Blue Dot used to be the same way, tho I'm told the new formula is less so.

    I would suggest you might have some reading to do...
     
    Last edited: Oct 14, 2011
  15. GaryL

    GaryL Member

    Joined:
    Nov 21, 2006
    Messages:
    1,180
    Location:
    MN
    Like Walkalong pointed out, burn rate varies with application. A slow powder may be too slow for a light bullet but good for a heavy bullet in the same caliber. The heavier bullet causes the pressure to increase and the powder burns faster. The best evidence of that is to pour a small amount of powder on the ground and light it up. I promise you it will take longer to burn unconfined than it would to burn than an equivalent amount in a firearm.

    I find a burn rate chart is useful information, but only as a guide. If I have a specific application, I may choose a slower or faster powder for a number of reasons.

    Regarding AA#9 or 2400, I like 2400 a lot more for 44mag, and AA#9 (or H110) for small rifle applications.
     
  16. kingmt

    kingmt Member

    Joined:
    Nov 17, 2009
    Messages:
    3,604
    If you only read load data & copy it then I would agree. Most of my powder there is not much to no data for. I have to find out what powder it acts like then find it of the burn rate chart & see what other powders it is like. Then I may look at someones load data to see where I want to start instead of starting all over for each cartridge I want to try it in. I still normally see how low & high I can go but I only stick 1 bullet instead of 20.
     
  17. Shade Tree Welder

    Shade Tree Welder Member

    Joined:
    Oct 6, 2011
    Messages:
    9
    Powder burn rates are a function of pressure. The burn rate changes faster
    or slower as the pressure increases, some of this is the difference between
    flake, spheical and extruded grains and grains some of the difference is due
    to the composition of the powder, single base vs. double base.

    Some pistol/shotgun powders which typically see less than 20 kpsi;
    will burn much much faster in a normally moderate 30-40 kpsi rifle
    round. So if you sellect a powder from the "relative burn rate chart"
    (I hate the things because they can get the unknowning in alot of
    danger) your actual chamber pressure can be 60-70 kpsi and result
    in the rupturing/failure of the rifle chamber, possibly injuring or killing
    the shooter or spectator.

    Becareful when going outside of published data.
     
  18. Walkalong

    Walkalong Moderator

    Joined:
    Nov 20, 2006
    Messages:
    48,363
    Location:
    Alabama
    They are useful for picking another powder to try that might work in the same application, or showing that a powder is way too fast or slow for an application, but that is about it.

    They use a "closed bomb" test to rank them in burn rate. Not really very similar to loaded rounds.
     
  19. GrayDog

    GrayDog Member

    Joined:
    Jun 14, 2011
    Messages:
    8
    Location:
    San Juan County, WA
Thread Status:
Not open for further replies.

Share This Page