Has anyone ever had their necks shrink on their own? Five days ago I shot 100 rounds out of my new 6547. The same day I decap, SS tumble and dry. Before and after this initial process checking the necks, a bullet slides right in as does the mandrels (expander and turning). I checked them again last night....bullets and mandrels aren't going in! The neck chamber on the gun is .293, the cases have not been sized yet and this is the first firing. They've been sitting in the loading block on my bench in approx 62-66 degrees. It appears the the necks shrunk on their own somehow. Even after annealing last night..still tight. Looks like I'll have to take the bushing out when I do size them.