lease, butt in all you want,these are all good tips, for sure.
The best caps I have ever used are CCI, I have got them soaked form a dunking and dried them out the next day and they still worked - wouldn't recommend it , though!
I make a habit of clearing my guns every evening , for sure, don't like to leave a charge in there unless I am going to be in the hotel room with them and the air is not too humid.
many shooters I know keep a few kernels of rice in their powder horns to help absorb moisture.
Cat