Well.......load a couple thousand a month for 40 years and lube gets to be a real pain in the wazoo. Carbide: good stuff. Rifle cases(bottleneck) need to be lubed because the only part of the die that's carbide is the neck expander button unless manufacturers have come up with something new since I bought my last rifle dies...it's been a few years. Give it a try both ways as MrPhill suggests, you've got nothing to loose!