Have a new barrel in .223. Fired 100 times, went to neck size the 100 brass.
Backed off fl die 1/4 turn, sized body. Backed off die 1/2 turn it sized the body.
Turned the die 1 full turn from shellholder. it still sized the body.
This is a new, name brand barrel. Have neck sized much brass with these same dies
This only happens with brass from this barrel. Do I have an oversize chamber?