Today I was depriming my .45 expended casings and ran across a Federal round that has an undersized primer pocket. All of my depriming/priming is done by hand so it was easy to recognize it. The head of the casing is NOT marked like the NT rounds were. You just have to look for it. If you are running a progressive loader, you might not spot it when it comes to depriming and resizing your shells. I used my micrometer to try to gauge the size of the primer well and the Federal round measured @.204. I also gauged some of the other rounds I had already deprimed and the primer pocket gauged @.244. Thats .40 difference in primer well sizes. I could be off just a hair on my measurements, BUT I know I am close to being exact. Once before and I put it on this site that I had ran across some casings with small primer pockets but they were marked NT(non toxic) however this casing is NOT marked. I encourage all who reload to carefully inspect your rounds prior to reloading as it is easy to just assume that all primer wells are the same and they are not. Do not take anything for granted. Should anyone else run across this situation, please let me know what type of casings you have run across (brand or name or some sort of ID for the round).