Carbide is not a replacement for lubing. Yes, you can resize without lube, but it requires more effort. You don't need to get carried away with the lube, I like the aerosol lubes, putting the cases in a plastic bag, spraying in a few shots and shaking the bag up to disperse the lube.
The reason carbide is used for resizing is to avoid damaging the resizing die with dirt not cleaned off the old case. Before carbide was used, you needed to be careful in cleaning and lubing your cases or the sizing die could (did) get scratches, which would then transfer on to subsequent cases. Extreme instances required removal of the die and polishing, but you can only do that so many times before the dies becomes out of spec.
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So many S&W's, so few funds!!
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