I can trim them in roughly the same amount of time I can measure them, so I just trim. I usually buy my brass by the 100 and put it all back in the same box as I fire it. Process it all at one time, and every time I go through the box it gets another black line on the inside top lid. Amazingly, there always seems to be a few that do not trim at all and a few that get a lot taken off them when I go through the 10 or 98 or whatever is left.
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