Strange marks on rim, rounds hard to chamber?

[mattri]

All cases have been through a body die, neck sized with a Lee collet die and trimmed.

[Westcliffe01]

You did that before you fired it or before you tried chambering it and it stuck ? Have you tried them in the body die since you know they stick ? Do you touch the shell holder to the die when you size ?

The only thing that the body die will not replicate is the fit of the neck in the chamber. If the brass is long you may be crimping the bullet. But you say you trimmed...

I am concerned that you think you did all that stuff but somehow you missed something. If it chambers hard now, it should fit tight in your body die. If not, then the body die is out of spec.