There are exceptions though if you carry it alot, like going hunting etc... because the powder will tumble around in your pocket makeing the powder kind of wear in away that will act diffrent could make it a hotter laod, then the powder has a coating of something that I forgot what the name was but if it wears off from tumbling around after some amount of time it will change the load, maybe accuracy, or other things.

If you was a handloader and you loaded close to a hot load or hot, then you carried it a couple seasons and you shot it on a hot day, it may go over the limits! Hodgdon can tell you this..

Troy