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Message: <blockquote data-quote="SDMF" data-source="post: 316519" data-attributes="member: 412">Dillon 750 w/case-feeder is a superb machine for straighwall cartridge or prepped bottleneck brass. Give or take, ~800+ rounds/hr. Simple swap from 380-9MM, assuming you use the same brand primers for your loads it's just a die swap/powder recalc, or, even easier, have a toolhead/powder measurer set up for each and it's a 2-pin ~30sec swap.Swapping primer sizes makes for a ~10Min swap-over, and, again, having a toolhead/powder-measurer set up for each chambering will save you significant time regarding setup/swapover.The 550 is slower, but simpler and quicker to swap-over. I could be happy loading pistol cartridges on either the 550 or 750. I prefer to run rifle ammo (except 223's) on the 550. A 550 will run @ 350-400 rounds/hr.FWIW, I'm 46 and still using the Dillon 550 my dad bought when I was in Jr. High. It's never been back to Dillon for anything, just clicks along doing it's thing so predictably it's mind-numbing. One caveat, ball/flake/spherical powders are your friend. "Extruded" powders can be maddening through a progressive powder measurer. Ball/flake/spherical will run +/- .1gn for hours on end. If I let the machine sit for a few hrs, I'll dump the 1st 2-3 powder charges right back into the powder hopper, then weigh the next few to make sure I'm spot on, then run again until I'm done.</blockquote>