We retired 8 years ago and have been traveling the country ever since in our motor home, always following the good weather. Never too hot, never too cold. Just sort of nice and in between. And I've loaded on many picnic tables along the way. However we settled into a house a few weeks ago here in southern Florida where it gets hot in the summer. And boy, I mean hot.
After getting my loading room set up I went out to the RV and got my cast, lubed and sized bullets out of the outside bin, where they been sitting for quite a while. I wanted to shoot the next day so I figured I better load them. Well, guess what? They were a solid mass cemented together with sticky, half solidified goo!!! Now that's what you call a brick of bullets!!
However, they were fine once I boiled them well and put on new lube.