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I guess I should have clarified my experience with the ND sizing die. The elliptical expander nipple is ideal for shaping up case necks that have a severe dent (esp. military cases of many calibers). Standard expander nipples often cannot un-dent these cases without damaging the mouth. This un-denting can take extra pressure to force the expander nipple over/through the dent to straighten it out. This extra force is the cause of the slippage in the decapping stem. The same applies when using the elliptical nipple to expand, say, to a .338 or 8mm mouth from a .30 mouth. Anyway, I never had a problem with decapping. The Hornady friction nut was adequate for decapping every case style I've used.
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