New to the forum, Thanks for your help! I just started working with 223 rem. I am having a problem with neck sizing. After I've tumbled lubed and Full length resized the brass, I tried to trim to length and about half of the cases will not fit the pilot. The cases that do, fit very snugly, but they do fit. I have a Foster trimmer, It shouldn't make any difference but I bought the pilot for the outside neck turner and same thing. It seems that the expander ball is too small by a tiny bit, but i guess that doesn't explain why some fit and some don't. I gues I should add that the cases are military brass so I'm wondering if the buletts were crimped and the resizing die isn't taking that little crimp out enough. Has anyone had this experience? I've been reloading for 30yrs and have never run into this but this is the first time i've used military brass. I know it presents it's unique challenges but it is more abundant than factory brass and I thought it would be useful to learn how to work with it. It's easy to get brass at the range but the mil stuff is more common. Thanks for you ideas.