Tuning To Crown or not to Crown, that is the question!

...here are some examples of lead smearing behind the skirts ...

01-lead-smearing-jpg.438727
(thanks for chiming in, not my language I would never figure how to call that smearing phenomena when material is morphing :) )
I have polished my liners leade all to butter smooth , but when I push the pellet through a liner with a long rod, most likely the choke is deforming the pellet skirt and the bottom edge won't be flat anymore, pretty much looks like your picture (only smoother transition), the skirt is not sitting on flat...