Lee Precision Collet Necksizer Features The Lee Collet Necksizer for 6mm ARC uses a steel collet that squeezes the fired case neck against a precision mandrel producing a neck that is precisely aligned with the case body. This process significantly reduces runout compared to conventional sizing dies which directly translates to improved bullet concentricity and tighter groups at the range. Because the die sizes only the neck rather than the entire case body it preserves more of the brass s fire-formed fit to the chamber extending case life across multiple reloading cycles. This approach is recommended specifically for cases that have already been fired through the shooter s own firearm. Unlike many full-length sizing dies the Lee Collet Necksizer requires no case lubrication simplifying the reloading process and eliminating a step that can introduce inconsistency if not done carefully. This neck-only approach is favored by precision handloaders who want to maximize accuracy from a bolt-action rifle fed from the same chamber each time. Lee has built a reputation for producing reliable affordable reloading tools that deliver results competitive with far more expensive equipment. The Lee Collet Necksizer is a precision-focused reloading die for sale at GrabAGun for 6mm ARC shooters chasing better accuracy from their handloads. Lee Precision Collet Necksizer Specifications Manufacturer: Lee Precision Model: Collet Necksizer Caliber: 6mm ARC Die Type: Neck Sizer Die Available At: GrabAGun