I've just FL sized a load of .223 brass using RCBS dies (which aren't new) and come to trim them the case mouths wont fit over the pilot.

The pilot measures .220", as it's supposed to. my case mouths are measuring .218-.219", so no wonder they won't fit over the pilot!

Would someone mind measuring the case mouth internal diameter of a sized .223 case please? I would have thought it should be about .222"?

Unless anyone knows any different the conclusion I've come to is the expander ball in the die is worn out, does this sound feasible?

This is the first time I've used this die set which I was given off a friend, and looking at some of the old brass that this die set has done, they're tight too.

Might see if I can get a new expander/decapping pin holder and run them through again.

Cheers
Greg