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Powder Humidity

Discussion in 'Shooting Related Threads' started by amboy49, Feb 22, 2009.

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  1. amboy49

    amboy49 Well-Known Member

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    My reloaders sit in my attached garage. I reload all four gauges and move reloaders from the bench to a shelf where they sit for days/weeks at time. I don't empty the powder bottle when I'm finished reloading a particular gauge - and there is almost always some powder left in the bottle. Since I suffer the cold of Indiana ( notwithstanding global warming ) there is a relatively high amount of humidity in the garage as is evidenced by the frost on my garage door windows.

    What effect, if any, will humidity have on the powder left in the bottle and not used until the next reloading session for that specific gauge ? I assume capping the Mec powder bottle will not prevent moisture from getting to the powder since it can enter through the charge bar.
     
  2. phirel

    phirel TS Member

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    fred- Nice answer. If humidity were a problem, it would arise during the Summer.

    Pat Ireland
     
  3. ec90t

    ec90t Guest

    The one thing humidity will keep at bay is the biggest problem a reloader has to deal with, static electricity. This is responcible for more "blooper" shells than anything else.

    ec90t
     
  4. zzt

    zzt Well-Known Member

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    amboy49, the effect you may see is the weight of the charge thrown from your identical setup may vary from day to day according to humidity. I wouldn't worry about it, because you are actually measuring the powder by volume. So the fact that water vapor condensed (dew point does not enter into the picture here) on your powder and skewed the weight does not affect pressure or velocity. It wasn't until I bought a chronograph and proved this to myself that I stopped worrying about changed throw weights because of changing humidity.

    Pat came up with an interesting experimental result the last time this came up. Perhaps he will share it with you.
     
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