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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?
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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.