What I have read is that the problem is moisture affecting the load. I have had mine in for several days with no affect and shot fine. You could also point you barrel downward which would keep the moisture away from the load. Also, this could be dangerous. I had a friend that had his rifle loaded from a prior days hunt, and went hunting the next day. This was also a flint muzzleloader. Anyway, he hit the trigger while the gun was in the truck and when it struck the frizzum, it created a spark and the gun went off, without any powder in the pan.

Anyway, saftey is rule number one.

Good luck hunting....