Sinclair stainless steel neck turning mandrels are precision-crafted from high-grade stainless steel for calibers 17 to 50, with the 338 caliber mandrel sized at 0.336 inches.
The mandrels are designed with close tolerances—turning mandrels are 0.002 inches under bullet diameter, while expander mandrels are 0.001 inch under bullet diameter, ensuring consistent adjustments.
Large caliber mandrels, which range from 35 to 50 caliber, are compatible only with the Large Caliber Expander Body and the NT-5000 Turning Tool.