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Have you measured a large sample of your cases? How much varaiance did you find? When sorted by headstamp and measured, did you find any significant length differences within the same head stamp or between headstamps?
When these questions are answered, the "should I trim?" question is easier to address.
I load on a single stage press. I sort by headstamp. While applying the taper crimp (mostly just removing the case mouth expansion plus perhaps an additional 0.001 squeeze) I can often feel when I have a short case. I mutter some explatives aimed toward the sorry rat that trimmed a pistol case, followed by performing the thumb push test to check for a loose bullet leading to setback. But that's me.
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A lack of planning on your part does not necessarily constitute an emergency on my part.
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