trim: pre or post resizing?

[Potatohead]

Mr Andrew Leigh said:

If your cases grow after sizing (which I have had) this is due to insufficient lube on the inside of the case neck and the friction on the return stroke is sufficient to stretch the shoulders back out after having bumped them back originally.

PH asks: I hardly lube the inside of the case neck at all. Do you guys think that's in the "not to good of an approach" category? I just thought lubing the case neck would ease the operation, didnt realize it could stretch things that I'm not meaning to stretch. That does make sense now that I think about it though.

 

[higgite]

If your cases grow after sizing (which I have had) this is due to insufficient lube on the inside of the case neck and the friction on the return stroke is sufficient to stretch the shoulders back out after having bumped them back originally.

How do you explain case growth with bushing dies?