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I keep coming back to Brian's argument, and can't really find any fault with it - if you have a procedure or piece of equipment that's legal for use in competitive shooting, but no one at the highest echelon of the sport is using it, that's pretty telling.
The only counterargument I could think of would be if there's something else that the competitors are doing/using that would obviate the need for crimping, but I can't think of what that would be.
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