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My CZ's have a very tight chamber and short leade. Any slight bulge or spec difference will cause a jam, and my 75bd simply won't run without it when using Lee lead molds.
Let's face it, range pick-up brass varies greatly and no matter how exact your dies are, lead bullets don't always go in straight and off center seating is a common issue. A regular seating/crimping die doesn't iron out the issue.
Bottom line, I would rather deal with slight inaccuracy issues from swaged-down bullets being returned to SAAMI specs than have to deal with the occasional misfeed during a match or (God forbid) a SD situation.
On a side note, it's been proven the rifle FCD tightens up velocity spreads slightly.
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