On the other hand, I've never trimmed my 44 cases, and never seen the need too. A straight walled pistol case expands outwards; but length wise not so much, if any, because there's no cartridge taper to push against and stretch when it's fired.
However the length of the case may be a problem in that it can vary between manufacturers or between lots from the same manufacturer. Try to at least sort your cases by manufacturer, and adjust your dies between brand changes.