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I measured the width right at the end of the case and got .473. If that is out of the ballpark, would cranking down my crimper die about another 1/4 turn help?
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The single greatest problem causing the 45ACP's slide to fail closing that last 1/10" as you describe, is the mouth diameter.
Turn the die down whatever it takes to get 0.469 - 0.470 and see if that doesn't solve the problem.