Admitting defeat and emailing customer service

[BigMacMI]

Yes. They sent new one

 

[Walkalong]

You need a nice tight sizer because .380 brass is all over the place in case wall thickness. ................................................................................ If you still have neck tension issues, get Lee to replace it

Glad they got it fixed for you.

 

[Dudedog]

Cool,
Haven't had to deal with Lee CS very often but anytime I had and issue they made it right.

Glad they made it right for you and the problem is taken care of.

.380 brass can be a pain because as mentioned it's all over the place thickness wise.
Of course if I bought new brass (I understand you can do this) that would solve the problem of the different thickness on mixed range brass.