Have you tried adjusting the sizing collar? I've been loading RST 16 gauge hulls for years on a MEC 600 with the short kit and have never experienced deformed brass. However, when I first started using the short kit, I had an issue with the sizer not resizing the brass all the way down to the rim. As for the crimp memory with cheddite hulls, after 2 - 3 loadings they seem to settle in pretty well for me.
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