Sinclair International's stainless steel expander mandrels are precision-crafted for cartridges from 17 to 50 caliber, with the 35 caliber mandrel being 0.001" under bullet diameter for optimal expansion.
The mandrels are made from high-grade stainless steel for durability, with carbide versions offering even tighter tolerances at 0.002" under bullet diameter for consistent adjustments.
Large caliber mandrels, including the 35 caliber (0.357" diameter), are designed to fit only the Large Caliber Expander Body and the NT-5000 Turning Tool, specialized for larger caliber reloading tasks.