I Would check the length after sizing and again after fire forming. Usually with the Improved cases...after fireforming...they tend to be pretty stable in terms of not increasing in length. I know when I sized from .30-06 down to .25-06 ( used a .270 in between ) I needed to trim the cases....but they didn't lengthen after fireforming. YMMV. Guess for safety..I'd measure both times.
Good Luck,
Wayne
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