Thanks txpete. I've been using the Lee Collett dies on my Contender .223 for a year now with no problems, but for my new Pro-Hunter .243 the first two or three times using the .243 collett die have been fine, but after that, I've had some issues with closing the barrel and cocking the hammer.
I've measured the amount of case that "hangs out" of the end of the barrel, and it appears I need to do some full sizeing to set back the shoulder.
I've not had this issue with the .223 on the Contender, but my guess is it must be a pressure issue with the .243 that the .223 doesn't have. That's just a "swag" on my part, but I can't think of what else it would be.
Dave