Originally Posted by J E Custom
"NO" it is not common with any new brass.
You should bring this up to winchester because it sounds like
a quality control problem.
Get the batch/Lot number off of the inside of the box before
you call and have the fired neck dia and the loaded ammo neck
O D because they will probably want to blame it on your rifle.
It should only expand about .004 over the loaded dia.
Winchester may deni any problems ,but you may save someone
else a more serious problem.
J E CUSTOM
for many years Winchester manufactured all their own raw brass in Indianapolis. But several years back they decided to close that plant, and who knows where the ingots come from now. I've heard that as much as 50% now comes from Asia.