Lee 3 or 4 die set for .380 ACP?

Well, yes and no. IF you have or choose to acquire an expansion reamer you can grind an undersized carbide ring to any OD you like. Carbide cuts horribly but grinds nicely.
That’s just an option.

No, that’s not “adjustable”. That’s “replaceable”.
 
Everything is an option with the right tools and enough money to replace things, but that's not "adjustable". Adjustable is something any owner can change easily. Screw it up, screw it down, etc.
 
Well, yes and no. IF you have or choose to acquire an expansion reamer you can grind an undersized carbide ring to any OD you like. Carbide cuts horribly but grinds nicely.
That’s just an option.
You can't touch the carbide ring with any sort of reamer. The only thing that will remove carbide is a diamond wheel or EDM process.
 
You can't touch the carbide ring with any sort of reamer. The only thing that will remove carbide is a diamond wheel or EDM process.
I always get a chuckle out of people telling me what can't be done. Especially the things I did as routine in aerospace.

Expansion reamers come in diamond, aluminum oxide and silicon carbide and in multiple grits. Flex-Hone has been around a long time. They're not even very expensive. If you don't mind limiting the life of your tool you can grind carbide with silicon carbide. You're only looking to remove one or two thousandths on an FCD. It's not like you're going to hog-out a 1/4 inch or something.

Everything is an option with the right tools and enough money to replace things, but that's not "adjustable".
I guess when I said, "Well, yes and no," I should have clarified that, "yes" you can make it larger but "no" that's not really adjustable. You're making an adjustment but it's not reversible.
 
Carbide can definitely be machined and ground with the correct cutting/grinding tools. Of course most outside of machine/tool and die shops won't have the proper tooling. I use to shape and sharpen carbide cutting tools all the time as a tool and die maker. So yes one could easily hone the carbide ring in a Lee die with the proper honing stones.
 
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