I have a little experience on both the 550 B and the Hornady LNL. I know when that time comes I will be doing the Hornady LNL since it is automated vs the you turn on the 550 B--------or whichever one pops up the cheapest in a good ol' boy deal!
Very good read on the Dillon, Hornady, and Lee.
http://www.comrace.ca/cmfiles/dillonLeeHornadyComparison.pdf
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