Case trimming

Usually when I see articles on case length trimming, it's talking about long brass. Is trimming required more for long brass than say, 9mm or 45 acp? And which case trimmer is prefered? Not so much "long", more high-pressure.

Very few handgun rounds have the pressure required to make the brass grow. Most often, handgun brass actually shrinks when fired. You take a "long", skinny cylinder and make it into a fatter (chamber sized) cylinder. By necessity, absent stretching in the case web which you will not normally get with most any handgun round, a wider cylinder is shorter than it's narrower self.

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