Burn rate & compairson chart

Discussion in 'The Ammo & Reloading Forum' started by bizy, Dec 20, 2009.

  1. bizy

    bizy New Member

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    I have about 20+ list of different gunpowders. Is there a chart that will compair burn rate of one gunpowder to other?
    Example: These are only examples..
    1 grain of American Pioneer Powder = 1/2 grain Bullseye.
  2. Bindernut

    Bindernut Well-Known Member

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    Most every reloading manual has a burn rate comparision chart. In the Hornady #7 manual, it's on pg.38.

    BUT...there are many more factors to calculate besides burn rate if you're looking for a powder "substitution" chart.
    As an example, you'll need to figure in the internal case volume of the cartridge you're reloading and the volume (bulk) of the powder you're using. These two alone will give you a variable in the % of volume in the case occupied by the powder and the % remaining volume (which is occupied by either air or the bullet seated on top of the charge)...that would be load density. Linearity, or non-linearity, of burn rate per a given charge volume/weight/load density/etc is also a factor that will change from cartridge to cartridge.

    That's why you won't see any grain-for-grain substitution charts.
    There are just too many variables to take into account for you to come up with a cut and dried "X equals Y" type of formula.
    1gr of Brand X might equal 2gr of Brand Y in one cartridge...but in another cartridge 1gr of Brand X might equal 3gr of Brand Y.
  3. Gearheadpyro

    Gearheadpyro New Member

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    +1 bindernut.

    The shape of the case, dimesions, % filled, and many other factors all contribute to the actual burn rate of a powder. Most reloading manuals will list the powders somewhere from the generally faster to generally slower, but it is by no means exact. It is not recommended to subsitute one powders load data for anothers. There is just too much that changes.
  4. steve4102

    steve4102 Former Guest

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  5. muddober

    muddober Active Member

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    While burn rate is mentioned in your post that does not appear to me to be your question, but rather the energy contained in one grain of one powder compared to the energy contained in one grain of another. The burning rate of the powder has nothing to do with the amount of energy contained in it pound for pound. As an example gasoline is more volatile (lower flash point and faster burning) than diesel fuel but diesel contains more energy pound for pound. I am not aware of any chart that will give you energy comparisons on powder but if it just burning rate you want to know just Google "powder burning rates" or "burning rates of powder"

    Ron
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