I have a Remington 223 VS, and I had the same problem, The chamber is so tight, if you did not use cases shot in the same rifle, a regular sizer would not do it. Don't even think about shooting 5.56 ammo in it, in most semi autos it will not be an issue, but I almost blew mine up shooting 55 grain Guatamalan surplus. My T/C 223 barrel would not even chamber factory 5.56 ammo.
I had the same issue with a 243, on sizing the expander ball would pull back the neck. I solved the issue by sizing once with the ball and then again without.
Just checked my VS wiith some of my 69 Nosler NM AR loads, either my reloading is getting better or the chamber grew, because they fit fine.
I don't have time for busy people
Last edited by hagar; February 17, 2013 at 09:15 PM.