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Old 10-10-2009, 08:54 PM
  #5  
bigcountry
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All powders are temperature sensitive. All primers are temperature sensitive. Some more than others. You can count on losing around 30-100fps when going from 80F to 0F with some powders. The extreme powders are a little better. I find RL22 to be one of the more sensitive, but I still use it. Ball powder is probably the most sensitive.

With reloading you have a controlled explosion. An explosion that creates controlled pressure. With any explosion, higher the temperture, more pressure. Don't matter what powder you use.