I decided to work on a .308 load and began to process some brass that I had stored away. The brass is Prime, once fired out of an FN SPR rifle. I deprimed and clean the brass with a wet tumbler and then let it sit overnight in a Frankford Arsenal dryer. When I got around to resizing the brass, I noticed that it was extremely difficult to size them. The die would stop approximately 1/2" from the base of the brass and would not budge much. Eventually I got a stuck case in my RCBS die. I bought a set of Hornady dies and tried again, making sure that everything was lubed well enough to not give me issues, but got the same results. At first I was using Hornady One Shot as a lube, then switched to Imperial Die Sizing wax, but there was no difference. Eventually I got a stuck case in my Hornady die. I measured the base of the Prime where it seems to be getting stuck and got 0.471. I compared it to some Hornady once fired brass I had laying around which measured 0.466, so only a .005 difference. Any ideas what might be going on? Will the .005 difference be getting the cases stuck?