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If you are crimping too hard, you are in effect, squeezing the bullet down, and brass springs back leaving a loose bullet.
Not sure if this is the case with what you are doing, but you could try backing off the crimping die a bit, and do the crimping and bullet seating in 2 seperate operations.
I wouldn't worry too much about trimming .45auto or any of those cartridges for that matter- in fact .45 auto cases have a tndancy to shrink, not grow in length from multiple firings and reloadings.
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