The longest I have left the gun loaded is a week using that method of fouling. I didn't have any noticable issues with it even though it snowed heavy on the first day of that hunt. At the end of the week I used a 100+ yard target to unload on and to check to see if the load would have any problems, it hit where I was aiming like it should have. I'm pretty sure they don't make the type of pellets I have anymore. I'm not sure of the name but I think Clean Shot was bought out by another company and the name was changed (possibly the formula also) to something else. Maybe someone else knows the answer to that question.