I have left mine loaded for two weeks without shooting.

If its cold outside when I am done hunting then I dont bring the gun inside - I just leave it in the garage. That way condensation dosent form to get moisture in the powder. Its like if you wear glasses and they are frozen or very cold then walk inside, you just want to avoid that with your gun.

You guys are having more cold weather in Texas than we are in Iowa this year - this mabye is a good tip for you.