Don't think the carbide cutters were availabe fot my Lyman when I bought my replacement several years back. Actually bought an additional because I was trimming cases for the .30 Herrett and this requires a lot of trimming and had a carbide been available I would have purchased it
I am a journeyman carpenter and I never buy non carbide tipped cutters unless they are not available for the tools or blades I am using. My experience with carbide cutters is they are sharper, cut smoother, and last longer.
Carbide cutters are worth the price. JMO.
Ken