As an alternative, you could sort your cases by headstamp.....hoping that like headstamps have the
Same case wall thickness....then sort by case length
Then adjust dies for each group.

Or trim 50 to 100 cases and see if that resolves your issue

Or run them all through the case trimmer at trim to length......it's likely some will not be trimmed at all
But they would all be the same length...... and if a length is cut off......as mikld says....chamfering the inside and deburring the outside helps

And you can lock down your dies for one length.

Regardless of trimming the cases.....you'll still need to expand the case mouth enough to start the bullet in the case.

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I'd like to agree with you BUT